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Mora I, Puiggròs F, Serras F, Gil-Cardoso K, Escoté X. Emerging models for studying adipose tissue metabolism. Biochem Pharmacol 2024; 223:116123. [PMID: 38484851 DOI: 10.1016/j.bcp.2024.116123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 03/11/2024] [Accepted: 03/11/2024] [Indexed: 03/17/2024]
Abstract
Understanding adipose metabolism is essential for addressing obesity and related health concerns. However, the ethical and scientific pressure to animal testing, aligning with the 3Rs, has triggered the implementation of diverse alternative models for analysing anomalies in adipose metabolism. In this review, we will address this issue from various perspectives. Traditional adipocyte cell cultures, whether animal or human-derived, offer a fundamental starting point. These systems have their merits but may not fully replicate in vivo complexity. Established cell lines are valuable for high-throughput screening but may lack the authenticity of primary-derived adipocytes, which closely mimic native tissue. To enhance model sophistication, spheroids have been introduced. These three-dimensional cultures better mimicking the in vivo microenvironment, enabling the study of intricate cell-cell interactions, gene expression, and metabolic pathways. Organ-on-a-chip (OoC) platforms take this further by integrating multiple cell types into microfluidic devices, simulating tissue-level functions. Adipose-OoC (AOoC) provides dynamic environments with applications spanning drug testing to personalized medicine and nutrition. Beyond in vitro models, genetically amenable organisms (Caenorhabditis elegans, Drosophila melanogaster, and zebrafish larvae) have become powerful tools for investigating fundamental molecular mechanisms that govern adipose tissue functions. Their genetic tractability allows for efficient manipulation and high-throughput studies. In conclusion, a diverse array of research models is crucial for deciphering adipose metabolism. By leveraging traditional adipocyte cell cultures, primary-derived cells, spheroids, AOoCs, and lower organism models, we bridge the gap between animal testing and a more ethical, scientifically robust, and human-relevant approach, advancing our understanding of adipose tissue metabolism and its impact on health.
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Affiliation(s)
- Ignasi Mora
- Brudy Technology S.L., 08006 Barcelona, Spain
| | - Francesc Puiggròs
- Eurecat, Centre Tecnològic de Catalunya, Biotechnology Area, 43204 Reus, Spain
| | - Florenci Serras
- Department of Genetics, Microbiology and Statistics, School of Biology, University of Barcelona and Institute of Biomedicine of the University of Barcelona, Diagonal 643, 08028 Barcelona, Spain
| | - Katherine Gil-Cardoso
- Eurecat, Centre Tecnològic de Catalunya, Nutrition and Health Unit, 43204 Reus, Spain
| | - Xavier Escoté
- Eurecat, Centre Tecnològic de Catalunya, Nutrition and Health Unit, 43204 Reus, Spain.
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2
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Li Z, Wang W, Li W, Duan H, Xu C, Tian X, Ning F, Zhang D. Co-methylation analyses identify CpGs associated with lipid traits in Chinese discordant monozygotic twins. Hum Mol Genet 2024; 33:583-593. [PMID: 38142287 DOI: 10.1093/hmg/ddad207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/29/2023] [Accepted: 12/05/2023] [Indexed: 12/25/2023] Open
Abstract
To control genetic background and early life milieu in genome-wide DNA methylation analysis for blood lipids, we recruited Chinese discordant monozygotic twins to explore the relationships between DNA methylations and total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and triglycerides (TG). 132 monozygotic (MZ) twins were included with discordant lipid levels and completed data. A linear mixed model was conducted in Epigenome-wide association study (EWAS). Generalized estimating equation model was for gene expression analysis. We conducted Weighted correlation network analysis (WGCNA) to build co-methylated interconnected network. Additional Qingdao citizens were recruited for validation. Inference about Causation through Examination of Familial Confounding (ICE FALCON) was used to infer the possible direction of these relationships. A total of 476 top CpGs reached suggestively significant level (P < 10-4), of which, 192 CpGs were significantly associated with TG (FDR < 0.05). They were used to build interconnected network and highlight crucial genes from WGCNA. Finally, four CpGs in GATA4 were validated as risk factors for TC; six CpGs at ITFG2-AS1 were negatively associated with TG; two CpGs in PLXND1 played protective roles in HDL-C. ICE FALCON indicated abnormal TC was regarded as the consequence of DNA methylation in CpGs at GATA4, rather than vice versa. Four CpGs in ITFG2-AS1 were both causes and consequences of modified TG levels. Our results indicated that DNA methylation levels of 12 CpGs in GATA4, ITFG2-AS1, and PLXND1 were relevant to TC, TG, and HDL-C, respectively, which might provide new epigenetic insights into potential clinical treatment of dyslipidemia.
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Affiliation(s)
- Zhaoying Li
- Department of Epidemiology and Health Statistics, The College of Public Health of Qingdao University, No. 308 Ning Xia Street, Qingdao 266071, Shandong Province, People's Republic of China
| | - Weijing Wang
- Department of Epidemiology and Health Statistics, The College of Public Health of Qingdao University, No. 308 Ning Xia Street, Qingdao 266071, Shandong Province, People's Republic of China
| | - Weilong Li
- Epidemiology and Biostatistics, Department of Public Health, University of Southern Denmark, J.B. Winsløws Vej 9 B, st. tv. Odense C DK-5000, Denmark
| | - Haiping Duan
- Qingdao Municipal Center for Disease Control and Prevention, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
- Qingdao Institute of Preventive Medicine, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
| | - Chunsheng Xu
- Qingdao Municipal Center for Disease Control and Prevention, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
- Qingdao Institute of Preventive Medicine, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
| | - Xiaocao Tian
- Qingdao Municipal Center for Disease Control and Prevention, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
- Qingdao Institute of Preventive Medicine, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
| | - Feng Ning
- Qingdao Municipal Center for Disease Control and Prevention, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
- Qingdao Institute of Preventive Medicine, No. 175 Shandong Road, Qingdao 266000, Shandong Province, People's Republic of China
| | - Dongfeng Zhang
- Department of Epidemiology and Health Statistics, The College of Public Health of Qingdao University, No. 308 Ning Xia Street, Qingdao 266071, Shandong Province, People's Republic of China
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3
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Lázaro SF, Tonhati H, Oliveira HR, Silva AA, Scalez DCB, Nascimento AV, Santos DJA, Stefani G, Carvalho IS, Sandoval AF, Brito LF. Genetic parameters and genome-wide association studies for mozzarella and milk production traits, lactation length, and lactation persistency in Murrah buffaloes. J Dairy Sci 2024; 107:992-1021. [PMID: 37730179 DOI: 10.3168/jds.2023-23284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 08/30/2023] [Indexed: 09/22/2023]
Abstract
Genetic and genomic analyses of longitudinal traits related to milk production efficiency are paramount for optimizing water buffaloes breeding schemes. Therefore, this study aimed to (1) compare single-trait random regression models under a single-step genomic BLUP setting based on alternative covariance functions (i.e., Wood, Wilmink, and Ali and Schaeffer) to describe milk (MY), fat (FY), protein (PY), and mozzarella (MZY) yields, fat-to-protein ratio (FPR), somatic cell score (SCS), lactation length (LL), and lactation persistency (LP) in Murrah dairy buffaloes (Bubalus bubalis); (2) combine the best functions for each trait under a multiple-trait framework; (3) estimate time-dependent SNP effects for all the studied longitudinal traits; and (4) identify the most likely candidate genes associated with the traits. A total of 323,140 test-day records from the first lactation of 4,588 Murrah buffaloes were made available for the study. The model included the average curve of the population nested within herd-year-season of calving, systematic effects of number of milkings per day, and age at first calving as linear and quadratic covariates, and additive genetic, permanent environment, and residual as random effects. The Wood model had the best goodness of fit based on the deviance information criterion and posterior model probabilities for all traits. Moderate heritabilities were estimated over time for most traits (0.30 ± 0.02 for MY; 0.26 ± 0.03 for FY; 0.45 ± 0.04 for PY; 0.28 ± 0.05 for MZY; 0.13 ± 0.02 for FPR; and 0.15 ± 0.03 for SCS). The heritability estimates for LP ranged from 0.38 ± 0.02 to 0.65 ± 0.03 depending on the trait definition used. Similarly, heritabilities estimated for LL ranged from 0.10 ± 0.01 to 0.14 ± 0.03. The genetic correlation estimates across days in milk (DIM) for all traits ranged from -0.06 (186-215 DIM for MY-SCS) to 0.78 (66-95 DIM for PY-MZY). The SNP effects calculated for the random regression model coefficients were used to estimate the SNP effects throughout the lactation curve (from 5 to 305 d). Numerous relevant genomic regions and candidate genes were identified for all traits, confirming their polygenic nature. The candidate genes identified contribute to a better understanding of the genetic background of milk-related traits in Murrah buffaloes and reinforce the value of incorporating genomic information in their breeding programs.
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Affiliation(s)
- Sirlene F Lázaro
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907; Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Humberto Tonhati
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Hinayah R Oliveira
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907; Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Alessandra A Silva
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Daiane C B Scalez
- Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - André V Nascimento
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | | | - Gabriela Stefani
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Isabella S Carvalho
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Amanda F Sandoval
- Department of Animal Science, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, 14884-900, SP, Brazil
| | - Luiz F Brito
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
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Mas-Parés B, Xargay-Torrent S, Carreras-Badosa G, Gómez-Vilarrubla A, Niubó-Pallàs M, Tibau J, Reixach J, Prats-Puig A, de Zegher F, Ibañez L, Bassols J, López-Bermejo A. Gestational Caloric Restriction Alters Adipose Tissue Methylome and Offspring's Metabolic Profile in a Swine Model. Int J Mol Sci 2024; 25:1128. [PMID: 38256201 PMCID: PMC10816194 DOI: 10.3390/ijms25021128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/12/2024] [Accepted: 01/15/2024] [Indexed: 01/24/2024] Open
Abstract
Limited nutrient supply to the fetus results in physiologic and metabolic adaptations that have unfavorable consequences in the offspring. In a swine animal model, we aimed to study the effects of gestational caloric restriction and early postnatal metformin administration on offspring's adipose tissue epigenetics and their association with morphometric and metabolic variables. Sows were either underfed (30% restriction of total food) or kept under standard diet during gestation, and piglets were randomly assigned at birth to receive metformin (n = 16 per group) or vehicle treatment (n = 16 per group) throughout lactation. DNA methylation and gene expression were assessed in the retroperitoneal adipose tissue of piglets at weaning. Results showed that gestational caloric restriction had a negative effect on the metabolic profile of the piglets, increased the expression of inflammatory markers in the adipose tissue, and changed the methylation of several genes related to metabolism. Metformin treatment resulted in positive changes in the adipocyte morphology and regulated the methylation of several genes related to atherosclerosis, insulin, and fatty acids signaling pathways. The methylation and gene expression of the differentially methylated FASN, SLC5A10, COL5A1, and PRKCZ genes in adipose tissue associated with the metabolic profile in the piglets born to underfed sows. In conclusion, our swine model showed that caloric restriction during pregnancy was associated with impaired inflammatory and DNA methylation markers in the offspring's adipose tissue that could predispose the offspring to later metabolic abnormalities. Early metformin administration could modulate the size of adipocytes and the DNA methylation changes.
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Affiliation(s)
- Berta Mas-Parés
- Obesity and Cardiovascular Risk in Pediatrics, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain; (B.M.-P.); (A.L.-B.)
| | - Sílvia Xargay-Torrent
- Obesity and Cardiovascular Risk in Pediatrics, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain; (B.M.-P.); (A.L.-B.)
| | - Gemma Carreras-Badosa
- Obesity and Cardiovascular Risk in Pediatrics, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain; (B.M.-P.); (A.L.-B.)
| | - Ariadna Gómez-Vilarrubla
- Materno-Fetal Metabolic Research, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain
| | - Maria Niubó-Pallàs
- Materno-Fetal Metabolic Research, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain
| | - Joan Tibau
- Benestar Animal, Institut de Recerca i Tecnología Agroalimentàries (IRTA), 17121 Monells, Spain;
| | | | - Anna Prats-Puig
- Department of Physical Therapy, EUSES, University of Girona, 17190 Salt, Spain;
| | - Francis de Zegher
- Department of Development and Regeneration, University of Leuven, 3000 Leuven, Belgium
| | - Lourdes Ibañez
- Endocrinology, Fundació Sant Joan de Déu, University of Barcelona, 08950 Esplugues de Llobregat, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, 28029 Madrid, Spain
| | - Judit Bassols
- Materno-Fetal Metabolic Research, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain
| | - Abel López-Bermejo
- Obesity and Cardiovascular Risk in Pediatrics, Girona Biomedical Research Institute (IDIBGI), 17190 Salt, Spain; (B.M.-P.); (A.L.-B.)
- Pediatrics, Hospital Dr. Josep Trueta, 17007 Girona, Spain
- Department of Medical Sciences, University of Girona, 17820 Girona, Spain
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5
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Tian H, Qiao H, Han F, Kong X, Zhu S, Xing F, Duan H, Li W, Wang W, Zhang D, Wu Y. Genome-wide DNA methylation analysis of body composition in Chinese monozygotic twins. Eur J Clin Invest 2023; 53:e14055. [PMID: 37392072 DOI: 10.1111/eci.14055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 06/06/2023] [Accepted: 06/20/2023] [Indexed: 07/02/2023]
Abstract
BACKGROUND Little is currently known about epigenetic alterations associated with body composition in obesity. Thus, we aimed to explore epigenetic relationships between genome-wide DNA methylation levels and three common traits of body composition as measured by body fat percentage (BF%), fat mass (FM) and lean body mass (LBM) among Chinese monozygotic twins. METHODS Generalized estimated equation model was used to regress the methylation level of CpG sites on body composition. Inference about Causation Through Examination Of Familial Confounding was used to explore the evidence of a causal relationship. Gene expression analysis was further performed to validate the results of differentially methylated genes. RESULTS We identified 32, 22 and 28 differentially methylated CpG sites (p < 10-5 ) as well as 20, 17 and eight differentially methylated regions (slk-corrected p < 0.05) significantly associated with BF%, FM and LBM which were annotated to 65 genes, showing partially overlapping. Causal inference demonstrated bidirectional causality between DNA methylation and body composition (p < 0.05). Gene expression analysis revealed significant correlations between expression levels of five differentially methylated genes and body composition (p < 0.05). CONCLUSIONS These DNA methylation signatures will contribute to increased knowledge about the epigenetic basis of body composition and provide new strategies for early prevention and treatment of obesity and its related diseases.
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Affiliation(s)
- Huimin Tian
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Haofei Qiao
- Qingdao Mental Health Centre, Qingdao, China
| | - Fulei Han
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Xiangjie Kong
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Shuai Zhu
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Fangjie Xing
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Haiping Duan
- Qingdao Municipal Centre for Disease Control and Prevention, Qingdao, China
| | - Weilong Li
- Population Research Unit, Faculty of Social Sciences, University of Helsinki, Helsinki, Finland
| | - Weijing Wang
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Dongfeng Zhang
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
| | - Yili Wu
- Department of Epidemiology and Health Statistics, Public Health College, Qingdao University, Qingdao, China
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Chen C, Ren H, Li H, Deng Y, Cui Q, Zhu J, Zhang S, Yu J, Wang H, Yu X, Yang S, Hu X, Peng Y. Identification of crucial modules and genes associated with backfat tissue development by WGCNA in Ningxiang pigs. Front Genet 2023; 14:1234757. [PMID: 37662841 PMCID: PMC10469685 DOI: 10.3389/fgene.2023.1234757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 08/07/2023] [Indexed: 09/05/2023] Open
Abstract
Fat deposition is an economically important trait in pigs. Ningxiang pig, one of the four famous indigenous breeds in China, is characterized by high fat content. The underlying gene expression pattern in different developmental periods of backfat tissue remains unclear, and the purpose of this investigation is to explore the potential molecular regulators of backfat tissue development in Ningxiang pigs. Backfat tissue (three samples for each stage) was initially collected from different developmental stages (60, 120, 180, 240, 300, and 360 days after birth), and histological analysis and RNA sequencing (RNA-seq) were then conducted. Fragments per kilobase of transcript per million (FPKM) method was used to qualify gene expressions, and differentially expressed genes (DEGs) were identified. Furthermore, strongly co-expressed genes in modules, which were named by color, were clustered by Weighted gene co-expression network analysis (WGCNA) based on dynamic tree cutting algorithm. Gene ontology (GO) and kyoto encyclopedia of genes and genomes (KEGG) enrichment were subsequently implemented, and hub genes were described in each module. Finally, QPCR analysis was employed to validate RNA-seq data. The results showed that adipocyte area increased and adipocyte number decreased with development of backfat tissue. A total of 1,024 DEGs were identified in five comparison groups (120 days vs. 60 days, 180 days vs. 120 days, 240 days vs. 180 days, 300 days vs. 240 days, and 360 days vs. 300 days). The turquoise, red, pink, paleturquoise, darkorange, and darkgreen module had the highest correlation coefficient with 60, 120, 180, 240, 300, and 360 days developmental stage, while the tan, black and turquoise module had strong relationship with backfat thickness, adipocyte area, and adipocyte number, respectively. Thirteen hub genes (ACSL1, ACOX1, FN1, DCN, CHST13, COL1A1, COL1A2, COL6A3, COL5A1, COL14A1, OAZ3, DNM1, and SELP) were recognized. ACSL1 and ACOX1 might perform function in the early developmental stage of backfat tissue (60 days), and FN1, DCN, COL1A1, COL1A2, COL5A1, COL6A3, and COL14A1 have unignorable position in backfat tissue around 120 days developmental stage. Besides, hub genes SELP and DNM1 in modules significantly associated with backfat thickness and adipocyte area might be involved in the process of backfat tissue development. These findings contribute to understand the integrated mechanism underlying backfat tissue development and promote the progress of genetic improvement in Ningxiang pigs.
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Affiliation(s)
- Chen Chen
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Huibo Ren
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Huali Li
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Yuan Deng
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Qingming Cui
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Ji Zhu
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Siyang Zhang
- Hunan Liushahe Ecological Animal Husbandry Co, Ltd., Changsha, China
| | - Jine Yu
- Hunan Liushahe Ecological Animal Husbandry Co, Ltd., Changsha, China
| | - Huiming Wang
- Hunan Liushahe Ecological Animal Husbandry Co, Ltd., Changsha, China
| | - Xiaodan Yu
- Hunan Liushahe Ecological Animal Husbandry Co, Ltd., Changsha, China
| | - Shiliu Yang
- Hunan Liushahe Ecological Animal Husbandry Co, Ltd., Changsha, China
| | - Xionggui Hu
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Yinglin Peng
- Department of Pig Breeding, Key Laboratory of Conservation and Genetic Analysis of Indigenous Pigs, Hunan Institute of Animal and Veterinary Science, Changsha, China
- Department of Animal Genetics and Breeding, College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
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7
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Avequin T, Lau KH, Waldhart AN, Guak H, Dykstra H, Krawczyk C, Wu N. Differential effects of sugar and fat on adipose tissue inflammation. iScience 2023; 26:107163. [PMID: 37456843 PMCID: PMC10338233 DOI: 10.1016/j.isci.2023.107163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 12/05/2022] [Accepted: 06/13/2023] [Indexed: 07/18/2023] Open
Abstract
Obese individuals experience low grade inflammation initiated within their adipose tissue. However, the early events that lead to the release of these inflammatory factors from adipose tissue are poorly characterized. To separate glucose effects from lipid effects on adipose tissue, we used an adipose-specific TXNIP knockout model where excess basal glucose influx into adipocytes led to modest increase in adiposity without using high fat diet. We found an uncoupling of two events that are generally presumed to be coregulated: (1) an increase of adipose tissue macrophage (ATM) number; and (2) pro-inflammatory activation of ATMs. These two events are associated with different triggering signals: elevated free fatty acids output and extracellular matrix remodeling with increased ATM number, whereas decreased adiponectin level with activated ATM. This separation reflects non-overlapping pathways regulated by glucose and lipids in adipocytes, and neither group alone is sufficient to elicit the full inflammatory response in adipose tissue.
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Affiliation(s)
| | - Kin H. Lau
- Van Andel Institute, Grand Rapids, MI 49503, USA
| | | | - Hannah Guak
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109, USA
| | | | | | - Ning Wu
- Van Andel Institute, Grand Rapids, MI 49503, USA
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Zhang S, Zhang Y, Zhang P, Wei Z, Ma M, Wang W, Tong W, Tian F, Hui H, Tian J, Chen Y. Plexin D1 mediates disturbed flow-induced M1 macrophage polarization in atherosclerosis. Heliyon 2023; 9:e17314. [PMID: 37389065 PMCID: PMC10300222 DOI: 10.1016/j.heliyon.2023.e17314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 06/06/2023] [Accepted: 06/13/2023] [Indexed: 07/01/2023] Open
Abstract
Atherosclerosis preferentially develops at bifurcations exposed to disturbed flow. Plexin D1 (PLXND1) responds to mechanical forces and drives macrophage accumulation in atherosclerosis. Here, multiple strategies were used to identify the role of PLXND1 in site-specific atherosclerosis. Using computational fluid dynamics and three-dimensional light-sheet fluorescence-microscopy, the elevated PLXND1 in M1 macrophages was mainly distributed in disturbed flow area of ApoE-/- carotid bifurcation lesions, and visualization of atherosclerosis in vivo was achieved by targeting PLXND1. Subsequently, to simulate the microenvironment of bifurcation lesions in vitro, we co-cultured oxidized low-density lipoprotein (oxLDL)-treated THP-1-derived macrophages with shear-treated human umbilical vein endothelial cells (HUVECs). We found that oscillatory shear induced the increase of PLXND1 in M1 macrophages, and knocking down PLXND1 inhibited M1 polarization. Semaphorin 3E, the ligand of PLXND1 which was highly expressed in plaques, strongly enhanced M1 macrophage polarization via PLXND1 in vitro. Our findings provide insights into pathogenesis in site-specific atherosclerosis that PLXND1 mediates disturbed flow-induced M1 macrophage polarization.
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Affiliation(s)
- Suhui Zhang
- Medical School of Chinese PLA, Chinese PLA General Hospital, Beijing, 100853, China
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Yingqian Zhang
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Peng Zhang
- School of Computer and Information Technology, Beijing Jiaotong University, Beijing, 100044, China
| | - Zechen Wei
- CAS Key Laboratory of Molecular Imaging, Beijing Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100080, China
| | - Mingrui Ma
- Medical School of Chinese PLA, Chinese PLA General Hospital, Beijing, 100853, China
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Wei Wang
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Wei Tong
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Feng Tian
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
| | - Hui Hui
- CAS Key Laboratory of Molecular Imaging, Beijing Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100080, China
| | - Jie Tian
- CAS Key Laboratory of Molecular Imaging, Beijing Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
- Key Laboratory of Big Data-Based Precision Medicine (Beihang University), Ministry of Industry and Information Technology of China, Beijing, 100191, China
- Zhuhai Precision Medical Center, Zhuhai People's Hospital, Affiliated with Jinan University, Zhuhai, 519000, China
| | - Yundai Chen
- Senior Department of Cardiology, The Sixth Medical Center of PLA General Hospital, Beijing, 100048, China
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English J, Orofino J, Cederquist CT, Paul I, Li H, Auwerx J, Emili A, Belkina A, Cardamone D, Perissi V. GPS2-mediated regulation of the adipocyte secretome modulates adipose tissue remodeling at the onset of diet-induced obesity. Mol Metab 2023; 69:101682. [PMID: 36731652 PMCID: PMC9922684 DOI: 10.1016/j.molmet.2023.101682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 01/22/2023] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVE Dysfunctional, unhealthy expansion of white adipose tissue due to excess dietary intake is a process at the root of obesity and Type 2 Diabetes development. The objective of this study is to contribute to a better understanding of the underlying mechanism(s) regulating the early stages of adipose tissue expansion and adaptation to dietary stress due to an acute, high-fat diet (HFD) challenge, with a focus on the communication between adipocytes and other stromal cells. METHODS We profiled the early response to high-fat diet exposure in wildtype and adipocyte-specific GPS2-KO (GPS2-AKO) mice at the cellular, tissue and organismal level. A multi-pronged approach was employed to disentangle the complex cellular interactions dictating tissue remodeling, via single-cell RNA sequencing and FACS profiling of the stromal fraction, and semi-quantitative proteomics of the adipocyte-derived exosomal cargo after 5 weeks of HFD feeding. RESULTS Our results indicate that loss of GPS2 in mature adipocytes leads to impaired adaptation to the metabolic stress imposed by HFD feeding. GPS2-AKO mice are significantly more inflamed, insulin resistant, and obese, compared to the WT counterparts. At the cellular level, lack of GPS2 in adipocytes impacts upon other stromal populations, with both the eWAT and scWAT depots exhibiting changes in the immune and non-immune compartments that contribute to an increase in inflammatory and anti-adipogenic cell types. Our studies also revealed that adipocyte to stromal cell communication is facilitated by exosomes, and that transcriptional rewiring of the exosomal cargo is crucial for tissue remodeling. Loss of GPS2 results in increased expression of secreted factors promoting a TGFβ-driven fibrotic microenvironment favoring unhealthy tissue remodeling and expansion. CONCLUSIONS Adipocytes serve as an intercellular signaling hub, communicating with the stromal compartment via paracrine signaling. Our study highlights the importance of proper regulation of the 'secretome' released by energetically stressed adipocytes at the onset of obesity. Altered transcriptional regulation of factors secreted via adipocyte-derived exosomes (AdExos), in the absence of GPS2, contributes to the establishment of an anti-adipogenic, pro-fibrotic adipose tissue environment, and to hastened progression towards a metabolically dysfunctional phenotype.
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Affiliation(s)
- Justin English
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, USA.
| | - Joseph Orofino
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA.
| | - Carly T. Cederquist
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA
| | - Indranil Paul
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Center for Network Systems Biology, Boston University, Boston, MA, USA.
| | - Hao Li
- Laboratory of Integrative Systems Physiology, Interfaculty Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland.
| | - Johan Auwerx
- Laboratory of Integrative Systems Physiology, Interfaculty Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland.
| | - Andrew Emili
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Center for Network Systems Biology, Boston University, Boston, MA, USA.
| | - Anna Belkina
- Flow Cytometry Core Facility, Boston University School of Medicine, Boston, MA, USA; Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA, USA.
| | - Dafne Cardamone
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA.
| | - Valentina Perissi
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; School of Life Science, Northwestern Polytechnical University, Xi'an 710072, China.
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Adipocyte-Specific Laminin Alpha 4 Deletion Preserves Adipose Tissue Health despite Increasing Adiposity. Biomedicines 2022; 10:biomedicines10092077. [PMID: 36140178 PMCID: PMC9495590 DOI: 10.3390/biomedicines10092077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/20/2022] [Accepted: 08/21/2022] [Indexed: 11/22/2022] Open
Abstract
Laminins are heterotrimeric glycoproteins with structural and functional roles in basement membranes. The predominant laminin alpha chain found in adipocyte basement membranes is laminin α4 (LAMA4). Global LAMA4 deletion in mice leads to reduced adiposity and increased energy expenditure, but also results in vascular defects that complicate the interpretation of metabolic data. Here, we describe the generation and initial phenotypic analysis of an adipocyte-specific LAMA4 knockout mouse (Lama4AKO). We first performed an in-silico analysis to determine the degree to which laminin α4 was expressed in human and murine adipocytes. Next, male Lama4AKO and control mice were fed chow or high-fat diets and glucose tolerance was assessed along with serum insulin and leptin levels. Adipocyte area was measured in both epididymal and inguinal white adipose tissue (eWAT and iWAT, respectively), and eWAT was used for RNA-sequencing. We found that laminin α4 was highly expressed in human and murine adipocytes. Further, chow-fed Lama4AKO mice are like control mice in terms of body weight, body composition, and glucose tolerance, although they have larger eWAT adipocytes and lower insulin levels. High-fat-fed Lama4AKO mice are fatter and more glucose tolerant when compared to control mice. Transcriptionally, the eWAT of high-fat fed Lama4AKO mice resembles that of chow-fed control mice. We conclude from these findings that adipocyte-specific LAMA4 deletion is protective in an obesogenic environment, even though overall adiposity is increased.
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11
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The potential inhibitory effect of ginsenoside Rh2 on mitophagy in UV-irradiated human dermal fibroblasts. J Ginseng Res 2022; 46:646-656. [PMID: 36090683 PMCID: PMC9459079 DOI: 10.1016/j.jgr.2022.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/27/2022] [Accepted: 02/03/2022] [Indexed: 11/30/2022] Open
Abstract
Background In addition to its use as a health food, ginseng is used in cosmetics and shampoo because of its extensive health benefits. The ginsenoside, Rh2, is a component of ginseng that inhibits tumor cell proliferation and differentiation, promotes insulin secretion, improves insulin sensitivity, and shows antioxidant effects. Methods The effects of Rh2 on cell survival, extracellular matrix (ECM) protein expression, and cell differentiation were examined. The antioxidant effects of Rh2 in UV-irradiated normal human dermal fibroblast (NHDF) cells were also examined. The effects of Rh2 on mitochondrial function, morphology, and mitophagy were investigated in UV-irradiated NHDF cells. Results Rh2 treatment promoted the proliferation of NHDF cells. Additionally, Rh2 increased the expression levels of ECM proteins and growth-associated immediate-early genes in ultraviolet (UV)-irradiated NHDF cells. Rh2 also affected antioxidant protein expression and increased total antioxidant capacity. Furthermore, treatment with Rh2 ameliorated the changes in mitochondrial morphology, induced the recovery of mitochondrial function, and inhibited the initiation of mitophagy in UV-irradiated NHDF cells. Conclusion Rh2 inhibits mitophagy and reinstates mitochondrial ATP production and membrane potential in NHDF cells damaged by UV exposure, leading to the recovery of ECM, cell proliferation, and antioxidant capacity.
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12
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LONG-TERM IMPROVEMENT OF ADIPOCYTE INSULIN ACTION DURING BODY WEIGHT RELAPSE AFTER BARIATRIC SURGERY: A LONGITUDINAL COHORT STUDY. Surg Obes Relat Dis 2022; 18:683-692. [DOI: 10.1016/j.soard.2022.02.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/08/2022] [Accepted: 02/11/2022] [Indexed: 12/19/2022]
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13
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Identification of Scd5 as a functional regulator of visceral fat deposition and distribution. iScience 2022; 25:103916. [PMID: 35252813 PMCID: PMC8889148 DOI: 10.1016/j.isci.2022.103916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 12/24/2021] [Accepted: 02/09/2022] [Indexed: 11/20/2022] Open
Abstract
Ectopic deposition of visceral adipose tissue (VAT) in abdomen is usually accompanied with systematic chaos of energy metabolism, a higher risk of cardiovascular diseases and type II diabetes. Here, we identified a previously unexplored gene Scd5 as a master regulator of fat distribution, which alone plays a significant role in determining the VAT accumulation. Firstly, zebrafish scd5 had the highest homology with human SCD5 compared to other SCDs in mouse and rat. We then observed that scd5-homozygous mutant zebrafish displayed a puffy, short and rounded apple-shaped figure. Whole-mount micro-CT scan showed that excessive VAT deposition and short spine are responsible for the abnormal body ratio. And the supplementation of ω3-polyunsaturated fatty acid (ω3-PUFA) in dietary significantly decreased VAT accumulation in scd5−/− zebrafish. Lastly, transcriptional analyses revealed that the Wnt, PPAR, C/EBP, and fat synthesis signaling pathways are significantly affected in the VAT of scd5−/− mutant and restored by ω3-PUFA. Zebrafish scd5 is a better match of homolog to human SCD5 scd5 deficiency induced significant VAT depositions in zebrafish Supplementation of ω3-PUFA significantly reduced the VAT deposition in scd5 mutants
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Lepanto P, Levin-Ferreyra F, Koziol U, Malacrida L, Badano JL. Insights into in vivo adipocyte differentiation through cell-specific labeling in zebrafish. Biol Open 2021; 10:271875. [PMID: 34409430 PMCID: PMC8443861 DOI: 10.1242/bio.058734] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 08/10/2021] [Indexed: 01/04/2023] Open
Abstract
White adipose tissue hyperplasia has been shown to be crucial for handling excess energy in healthy ways. Though adipogenesis mechanisms have been underscored in vitro, we lack information on how tissue and systemic factors influence the differentiation of new adipocytes. While this could be studied in zebrafish, adipocyte identification currently relies on neutral lipid labeling, thus precluding access to cells in early stages of differentiation. Here we report the generation and analysis of a zebrafish line with the transgene fabp4a(-2.7):EGFPcaax. In vivo confocal microscopy of the pancreatic and abdominal visceral depots of transgenic larvae, revealed the presence of labeled mature adipocytes as well as immature cells in earlier stages of differentiation. Through co-labeling for blood vessels, we observed a close interaction of differentiating adipocytes with endothelial cells through cell protrusions. Finally, we implemented hyperspectral imaging and spectral phasor analysis in Nile Red-labeled transgenic larvae and revealed the lipid metabolic transition towards neutral lipid accumulation of differentiating adipocytes. Altogether our work presents the characterization of a novel adipocyte-specific label in zebrafish and uncovers previously unknown aspects of in vivo adipogenesis. This article has an associated First Person interview with the first author of the paper. Summary: Analysis of the differentiation of adipocytes in vivo through cell-specific labeling in zebrafish, revealed their early interaction with blood vessels as well as early lipid metabolic changes.
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Affiliation(s)
- Paola Lepanto
- Human Molecular Genetics Lab, Institut Pasteur de Montevideo, Montevideo, Mataojo 2020, CP11400, Uruguay
| | - Florencia Levin-Ferreyra
- Human Molecular Genetics Lab, Institut Pasteur de Montevideo, Montevideo, Mataojo 2020, CP11400, Uruguay
| | - Uriel Koziol
- Sección Biología Celular, Facultad de Ciencias, Universidad de la República, Montevideo, Igua 4225, CP11400, Uruguay
| | - Leonel Malacrida
- Advanced Bioimaging Unit, Institut Pasteur de Montevideo and Universidad de la República, Montevideo, Mataojo 2020, CP11400, Uruguay.,Departamento de Fisiopatología, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Av. Italia s/n, CP11600, Uruguay
| | - José L Badano
- Human Molecular Genetics Lab, Institut Pasteur de Montevideo, Montevideo, Mataojo 2020, CP11400, Uruguay
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Yao EJ, Babbs RK, Kelliher JC, Luttik KP, Borrelli KN, Damaj MI, Mulligan MK, Bryant CD. Systems genetic analysis of binge-like eating in a C57BL/6J x DBA/2J-F2 cross. GENES, BRAIN, AND BEHAVIOR 2021; 20:e12751. [PMID: 33978997 PMCID: PMC9361732 DOI: 10.1111/gbb.12751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 05/04/2021] [Accepted: 05/11/2021] [Indexed: 12/19/2022]
Abstract
Binge eating is a heritable trait associated with eating disorders and refers to the rapid consumption of a large quantity of energy-dense food that is, associated with loss of control and negative affect. Binge eating disorder is the most common eating disorder in the United States; however, the genetic basis is unknown. We previously identified robust mouse inbred strain differences between C57BL/6J and DBA/2J in binge-like eating of sweetened palatable food in an intermittent access, conditioned place preference paradigm. To map the genetic basis of changes in body weight and binge-like eating (BLE) and to identify candidate genes, we conducted quantitative trait locus (QTL) analysis in 128 C57BL/6J x DBA/2J-F2 mice combined with PheQTL and trait covariance analysis in GeneNetwork2 using legacy BXD-RI trait datasets. We identified a QTL on Chromosome 18 influencing changes in body weight across days in females (log of the odds [LOD] = 6.3; 1.5-LOD: 3-12 cM) that contains the candidate gene Zeb1. We also identified a sex-combined QTL influencing initial palatable food intake on Chromosome 5 (LOD = 5.8; 1.5-LOD: 21-28 cM) that contains the candidate gene Lcorl and a second QTL influencing escalated palatable food intake on Chromosome 6 in males (LOD = 5.4; 1.5-LOD: 50-59 cM) that contains the candidate genes Adipor2 and Plxnd1. Finally, we identified a suggestive QTL in females for slope of BLE on distal Chromosome 18 (LOD = 4.1; p = 0.055; 1.5-LOD: 23-35 cM). Future studies will use BXD-RI strains to fine map loci and support candidate gene nomination for gene editing.
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Affiliation(s)
- Emily J. Yao
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
| | - Richard K. Babbs
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
| | - Julia C. Kelliher
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
| | - Kimberly P. Luttik
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
| | - Kristyn N. Borrelli
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
- Graduate Program for Neuroscience, Boston University, Boston, MA 02215 USA
- Tranformative Training Program in Addiction Science (TTPAS), Boston University, Boston, MA 02118 USA
- Biomolecluar Pharmacology Training Program, Boston University School of Medicine, Boston, MA 02118 USA
| | - M. Imad Damaj
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298 USA
| | - Megan K. Mulligan
- Department of Genetics, Genomics, and Informatics, The University of Tennessee Health Science Center, Memphis, TN 38163 USA
| | - Camron D. Bryant
- Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA 02118 USA
- Graduate Program for Neuroscience, Boston University, Boston, MA 02215 USA
- Tranformative Training Program in Addiction Science (TTPAS), Boston University, Boston, MA 02118 USA
- Biomolecluar Pharmacology Training Program, Boston University School of Medicine, Boston, MA 02118 USA
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Ithal D, Sukumaran SK, Bhattacharjee D, Vemula A, Nadella R, Mahadevan J, Sud R, Viswanath B, Purushottam M, Jain S. Exome hits demystified: The next frontier. Asian J Psychiatr 2021; 59:102640. [PMID: 33892377 DOI: 10.1016/j.ajp.2021.102640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/26/2021] [Indexed: 12/13/2022]
Abstract
Severe mental illnesses such as schizophrenia and bipolar disorder have complex inheritance patterns, involving both common and rare variants. Whole exome sequencing is a promising approach to find out the rare genetic variants. We had previously reported several rare variants in multiplex families with severe mental illnesses. The current article tries to summarise the biological processes and pattern of expression of genes harbouring the aforementioned variants, linking them to known clinical manifestations through a methodical narrative review. Of the 28 genes considered for this review from 7 families with multiple affected individuals, 6 genes are implicated in various neuropsychiatric manifestations including some variations in the brain morphology assessed by magnetic resonance imaging. Another 15 genes, though associated with neuropsychiatric manifestations, did not have established brain morphological changes whereas the remaining 7 genes did not have any previously recorded neuropsychiatric manifestations at all. Wnt/b-catenin signaling pathway was associated with 6 of these genes and PI3K/AKT, calcium signaling, ERK, RhoA and notch signaling pathways had at least 2 gene associations. We present a comprehensive review of biological and clinical knowledge about the genes previously reported in multiplex families with severe mental illness. A 'disease in dish approach' can be helpful to further explore the fundamental mechanisms.
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Affiliation(s)
- Dhruva Ithal
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Salil K Sukumaran
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Debanjan Bhattacharjee
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Alekhya Vemula
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Ravi Nadella
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Jayant Mahadevan
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Reeteka Sud
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Biju Viswanath
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
| | - Meera Purushottam
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India.
| | - Sanjeev Jain
- Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
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17
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Causal associations of waist circumference and waist-to-hip ratio with type II diabetes mellitus: new evidence from Mendelian randomization. Mol Genet Genomics 2021; 296:605-613. [PMID: 33629185 DOI: 10.1007/s00438-020-01752-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 12/13/2020] [Indexed: 10/22/2022]
Abstract
Type II diabetes mellitus (T2DM) is a metabolic disease with high incidence, which has seriously affected human life and health. The associations among waist circumference (WC), waist-to-hip ratio (WHR), and T2DM were discovered in observational studies. However, the causality of these associations still remains unknown. The present study aims to apply two-sample Mendelian randomization (TSMR) using genetic variants as instrumental variables (IVs) to evaluate the causality among WC, WHR, and T2DM. The participants were from three independent studies in genome-wide association studies (GWAS) datasets, which included 127,997 Europeans for WC, 73,137 Europeans for WHR and 659,316 Europeans for T2DM. Furthermore, 16 were associated WC SNPs and eight were associated WHR SNPs as instrument variables were selected for TSMR using P < 5 × 10-8 standard. The pooled odd ratios (ORs) for the assessment of higher WC and WHR on the risk of T2DM for these SNPs were calculated using inverse variance weighted (IVW) method, and validated through extensively complementary analyses. The OR for T2DM per SD (cm) higher WC was 2.623 (95% CI 2.286-3.010, P = 5.000E-43), and the OR for T2DM per SD (cm) higher WHR was 1.751 (95% CI 1.122-2.733, P = 0.014). Consistent results for other methods were obtained. Furthermore, the range of OR fluctuation between WC and T2DM was from 2.623 to 2.986, while that between WHR and T2DM was from 0.990 to 2.931. Overall, these present results provide genetic support that suggests that the use of TSMR, and higher WC and WHR increased the T2DM risk among the European population.
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Li J, Hu K, He D, Zhou L, Wang Z, Tao Y. Prognostic Value of PLXND1 and TGF-β1 Coexpression and Its Correlation With Immune Infiltrates in Hepatocellular Carcinoma. Front Oncol 2021; 10:604131. [PMID: 33489909 PMCID: PMC7820679 DOI: 10.3389/fonc.2020.604131] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/23/2020] [Indexed: 12/19/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is the most common primary liver malignancy with no curative treatments. Plexin D1 (PLXND1) is a cellular receptor whose functions have been explored in several human cancers; however, the critical roles of PLXND1 in HCC have rarely been probed. Therefore, the present study attempted to elucidate the expression pattern, prognostic significance, and potential roles of PLXND1 in HCC. We found that PLXND1 expression in HCC tissues was significantly higher compared with normal liver tissue from Gene Expression Profiling Interactive Analysis (GEPIA) and Integrative Molecular Database of Hepatocellular Carcinoma (HCCDB) databases. This result was further validated by immunohistochemistry staining (IHC) using tissue microarrays, which contained 216 HCC cases collected from our hospital. Additionally, PLXND1 expression showed a significant correlation with several clinical characteristics, including tumor grade and tumor hemorrhage (TH). Moreover, TISIDB and GEPIA databases were used to investigate the roles of PLXND1 in tumor-immune system interactions in HCC. As an immunoinhibitor, transforming growth factor-beta (TGF-β1) displayed the greatest correlations with PLXND1 in HCC. Finally, Kaplan-Meier curves and Cox analysis were conducted to further examine the potential clinical value of PLXND1 in HCC. We described a subclassification of HCC based on PLXND1 and TGF-β1 expression, which could be used to predict clinical outcomes and patient prognosis. Taken together, the results of this study indicate that PLXND1 might be a promising prognostic biomarker and potential therapeutic target in HCC.
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Affiliation(s)
- Juanni Li
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Kuan Hu
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Dongren He
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Lei Zhou
- Department of Anesthesiology, Third Xiangya Hospital of Central South University, Changsha, China
| | - Zhiming Wang
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Yiming Tao
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha, China
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Wang T, Wei Q, Liang L, Tang X, Yao J, Lu Y, Qu Y, Chen Z, Xing G, Cao X. OSBPL2 Is Required for the Binding of COPB1 to ATGL and the Regulation of Lipid Droplet Lipolysis. iScience 2020; 23:101252. [PMID: 32650117 PMCID: PMC7348002 DOI: 10.1016/j.isci.2020.101252] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/03/2020] [Accepted: 06/04/2020] [Indexed: 12/22/2022] Open
Abstract
The accumulation of giant lipid droplets (LDs) increases the risk of metabolic disorders including obesity and insulin resistance. The lipolysis process involves the activation and transfer of lipase, but the molecular mechanism is not completely understood. The translocation of ATGL, a critical lipolysis lipase, from the ER to the LD surface is mediated by an energy catabolism complex. Oxysterol-binding protein-like 2 (OSBPL2/ORP2) is one of the lipid transfer proteins that regulates intracellular cholesterol homeostasis. A recent study has proven that Osbpl2−/− pigs exhibit hypercholesterolemia and obesity phenotypes with an increase in adipocytes. In this study, we identified that OSBPL2 links the endoplasmic reticulum (ER) with LDs, binds to COPB1, and mediates ATGL transport. We provide important insights into the function of OSBPL2, indicating that it is required for the regulation of lipid droplet lipolysis. LD lipolysis is impaired in OSBPL2/osbpl2b-mutant HepG2 cells and zebrafish OSBPL2 interacts with COPB1, a subunit of the COPI complex located on LDs Altered COPI complexes on LDs may perturb the trafficking of lipolysis lipase ATGL
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Affiliation(s)
- Tianming Wang
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China
| | - Qinjun Wei
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China; Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing 211166, China; The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing 211166, China
| | - Lihong Liang
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China
| | - Xujun Tang
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China
| | - Jun Yao
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China; Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing 211166, China
| | - Yajie Lu
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China; Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing 211166, China
| | - Yuan Qu
- Jiangsu Cancer Hospital, Nanjing 210009, China
| | - Zhibin Chen
- Department of Otolaryngology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Guangqian Xing
- Department of Otolaryngology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Xin Cao
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing 211166, China; Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing 211166, China; The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing 211166, China.
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20
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Loh NY, Minchin JEN, Pinnick KE, Verma M, Todorčević M, Denton N, Moustafa JES, Kemp JP, Gregson CL, Evans DM, Neville MJ, Small KS, McCarthy MI, Mahajan A, Rawls JF, Karpe F, Christodoulides C. RSPO3 impacts body fat distribution and regulates adipose cell biology in vitro. Nat Commun 2020; 11:2797. [PMID: 32493999 PMCID: PMC7271210 DOI: 10.1038/s41467-020-16592-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 05/07/2020] [Indexed: 12/11/2022] Open
Abstract
Fat distribution is an independent cardiometabolic risk factor. However, its molecular and cellular underpinnings remain obscure. Here we demonstrate that two independent GWAS signals at RSPO3, which are associated with increased body mass index-adjusted waist-to-hip ratio, act to specifically increase RSPO3 expression in subcutaneous adipocytes. These variants are also associated with reduced lower-body fat, enlarged gluteal adipocytes and insulin resistance. Based on human cellular studies RSPO3 may limit gluteofemoral adipose tissue (AT) expansion by suppressing adipogenesis and increasing gluteal adipocyte susceptibility to apoptosis. RSPO3 may also promote upper-body fat distribution by stimulating abdominal adipose progenitor (AP) proliferation. The distinct biological responses elicited by RSPO3 in abdominal versus gluteal APs in vitro are associated with differential changes in WNT signalling. Zebrafish carrying a nonsense rspo3 mutation display altered fat distribution. Our study identifies RSPO3 as an important determinant of peripheral AT storage capacity.
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Affiliation(s)
- Nellie Y Loh
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | - James E N Minchin
- Department of Molecular Genetics and Microbiology, Duke Microbiome Center, Duke University, Durham, NC, 27710, USA
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, EH16 4TJ, UK
| | - Katherine E Pinnick
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | - Manu Verma
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | - Marijana Todorčević
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | - Nathan Denton
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | | | - John P Kemp
- The University of Queensland Diamantina Institute, University of Queensland, Woolloongabba, QLD 4102, Australia
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, BS8 2BN, UK
| | - Celia L Gregson
- Musculoskeletal Research Unit, Translational Health Sciences, University of Bristol, Southmead Hospital, Bristol, BS10 5NB, UK
| | - David M Evans
- The University of Queensland Diamantina Institute, University of Queensland, Woolloongabba, QLD 4102, Australia
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, BS8 2BN, UK
| | - Matt J Neville
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
- NIHR Oxford Biomedical Research Centre, OUH Foundation Trust, Oxford, OX3 7LE, UK
| | - Kerrin S Small
- Department of Twin Research and Genetic Epidemiology, King's College, London, SE1 7EH, UK
| | - Mark I McCarthy
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
- NIHR Oxford Biomedical Research Centre, OUH Foundation Trust, Oxford, OX3 7LE, UK
- Wellcome Trust Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
| | - Anubha Mahajan
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
- Wellcome Trust Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
| | - John F Rawls
- Department of Molecular Genetics and Microbiology, Duke Microbiome Center, Duke University, Durham, NC, 27710, USA
| | - Fredrik Karpe
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK.
- NIHR Oxford Biomedical Research Centre, OUH Foundation Trust, Oxford, OX3 7LE, UK.
| | - Constantinos Christodoulides
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK.
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Lundbäck V, Kulyté A, Arner P, Strawbridge RJ, Dahlman I. Genome-Wide Association Study of Diabetogenic Adipose Morphology in the GENetics of Adipocyte Lipolysis (GENiAL) Cohort. Cells 2020; 9:cells9051085. [PMID: 32349335 PMCID: PMC7291295 DOI: 10.3390/cells9051085] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 12/14/2022] Open
Abstract
An increased adipocyte size relative to the size of fat depots, also denoted hypertrophic adipose morphology, is a strong risk factor for the future development of insulin resistance and type 2 diabetes. The regulation of adipose morphology is poorly understood. We set out to identify genetic loci associated with adipose morphology and functionally evaluate candidate genes for impact on adipocyte development. We performed a genome-wide association study (GWAS) in the unique GENetics of Adipocyte Lipolysis (GENiAL) cohort comprising 948 participants who have undergone abdominal subcutaneous adipose biopsy with a determination of average adipose volume and morphology. The GWAS identified 31 genetic loci displaying suggestive association with adipose morphology. Functional evaluation of candidate genes by small interfering RNAs (siRNA)-mediated knockdown in adipose-derived precursor cells identified six genes controlling adipocyte renewal and differentiation, and thus of potential importance for adipose hypertrophy. In conclusion, genetic and functional studies implicate a regulatory role for ATL2, ARHGEF10, CYP1B1, TMEM200A, C17orf51, and L3MBTL3 in adipose morphology by their impact on adipogenesis.
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Affiliation(s)
- Veroniqa Lundbäck
- Lipid laboratory, Endocrinology Unit, Department of Medicine Huddinge, Karolinska Institutet, 171-77 Stockholm, Sweden; (V.L.); (A.K.); (P.A.)
| | - Agné Kulyté
- Lipid laboratory, Endocrinology Unit, Department of Medicine Huddinge, Karolinska Institutet, 171-77 Stockholm, Sweden; (V.L.); (A.K.); (P.A.)
| | - Peter Arner
- Lipid laboratory, Endocrinology Unit, Department of Medicine Huddinge, Karolinska Institutet, 171-77 Stockholm, Sweden; (V.L.); (A.K.); (P.A.)
| | - Rona J. Strawbridge
- Institute of Health and Wellbeing, University of Glasgow, College of Medicine, Veterinarian and Life Sciences, Glasgow G12-8RZ, UK;
- Department of Medicine Solna, Karolinska Institutet, 171-77 Stockholm, Sweden
- Health Data Research University of Glasgow, College of Medicine, Veterinarian and Life Sciences, Glasgow G12-8RZ, UK
| | - Ingrid Dahlman
- Lipid laboratory, Endocrinology Unit, Department of Medicine Huddinge, Karolinska Institutet, 171-77 Stockholm, Sweden; (V.L.); (A.K.); (P.A.)
- Correspondence:
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22
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Mashhadi Z, Huff Towle H, Schneider C, Davies SS. A Simple and Rapid Method to Measure Food Intake in Fish Using Brine Shrimp. Zebrafish 2020; 17:229-232. [PMID: 32125964 DOI: 10.1089/zeb.2019.1820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Food intake is a critical parameter in studies of energy balance, obesity, and metabolic disease, but previous methods to measure food intake in model fish species such as zebrafish (Danio rerio) have been labor intensive or indirect. In this study, we describe a simple and rapid method to measure food intake using freshly hatched brine shrimps as food source, followed by rapid collection using filtration of system water and quantification of collected shrimps using a photometric assay to measure extracted shrimp carotenoid content.
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Affiliation(s)
- Zahra Mashhadi
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee
| | - Hunter Huff Towle
- School of Medicine, University of North Dakota, Grand Forks, North Dakota
| | - Claus Schneider
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee
| | - Sean S Davies
- Department of Pharmacology, Vanderbilt University, Nashville, Tennessee
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23
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Elemans LM, Cervera IP, Riley SE, Wafer R, Fong R, Tandon P, Minchin JE. Quantitative analyses of adiposity dynamics in zebrafish. Adipocyte 2019; 8:330-338. [PMID: 31411107 PMCID: PMC6768273 DOI: 10.1080/21623945.2019.1648175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Adipose tissues often exhibit subtle, quantitative differences between individuals, leading to a graded series of adiposity phenotypes at the population level. Robust, quantitative analyses are vital for studying these differences. In this Commentary we highlight two articles from our lab that employ sensitive new methods in zebrafish capable of delineating complex and quantitative adiposity phenotypes. In the first article, we utilized in vivo imaging to systematically quantify zebrafish adipose tissues. We identified 34 regionally distinct zebrafish adipose tissues and developed statistical models to predict the size and variance of each adipose tissue over the course of zebrafish growth. We then employed these models to identify effects of strain and diet on adipose tissue growth. In the second article, we employed deep phenotyping to study complex disease-related adiposity traits. Using this methodology, we identified that adipose tissues have unique capacities to re-deposit lipid following food restriction and re-feeding. These distinct re-deposition potentials led to widespread fat distribution changes following re-feeding. We discuss how these novel findings may provide relevance to health conditions such as anorexia nervosa. Together, the strategies described in these two articles can be used as unbiased and quantitative methods to uncover new relationships between genotype, diet and adiposity.
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Affiliation(s)
- Loes M.H. Elemans
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | | | - Susanna E. Riley
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Rebecca Wafer
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Rosalyn Fong
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Panna Tandon
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - James E.N. Minchin
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
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24
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AL-Eitan LN, Alghamdi MA, Tarkhan AH, Al-Qarqaz FA. Gene Expression Profiling of MicroRNAs in HPV-Induced Warts and Normal Skin. Biomolecules 2019; 9:E757. [PMID: 31766385 PMCID: PMC6995532 DOI: 10.3390/biom9120757] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/16/2019] [Accepted: 11/19/2019] [Indexed: 01/03/2023] Open
Abstract
: Infection with the human papillomavirus (HPV) is a common occurrence among the global population, with millions of new cases emerging on an annual basis. Dysregulated microRNA (miRNA) expression is increasingly being identified to play a role in a number of different diseases, especially in the context of high-risk HPV infection. The present study investigated the miRNA expression profiles of warts induced by low-risk HPV. In warts, miR-27b, miR-24-1, miR-3654, miR-647, and miR-1914 were downregulated while miR-612 was upregulated compared to normal skin. Using miRTargetLink Human, experimentally supported evidence was obtained showing that miR-27b targeted the vascular endothelial growth factor C (VEGFC) and CAMP-responsive element binding protein 1 (CREB1) genes. The VEGFC and CREB1 genes have been reported to be involved in tumorigenesis and wart formation, respectively. Similarly, the oxidized low-density lipoprotein receptor 1 (OLR1) gene, which plays an important role in the humoral immunity of the skin, and the plexin D1 (PLXND1) gene, which is highly expressed in tumor vasculature, were both found to be common targets of miR-27b, miR-1914, and miR-612.
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Affiliation(s)
- Laith N. AL-Eitan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan;
- Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mansour A. Alghamdi
- Department of Anatomy, College of Medicine, King Khalid University, Abha 61421, Saudi Arabia;
| | - Amneh H. Tarkhan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan;
| | - Firas A. Al-Qarqaz
- Department of Internal Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan;
- Division of Dermatology, Department of Internal Medicine, King Abdullah University Hospital Jordan University of Science and Technology, Irbid 22110, Jordan
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25
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Haynes BA, Yang LF, Huyck RW, Lehrer EJ, Turner JM, Barabutis N, Correll VL, Mathiesen A, McPheat W, Semmes OJ, Dobrian AD. Endothelial-to-Mesenchymal Transition in Human Adipose Tissue Vasculature Alters the Particulate Secretome and Induces Endothelial Dysfunction. Arterioscler Thromb Vasc Biol 2019; 39:2168-2191. [PMID: 31434495 DOI: 10.1161/atvbaha.119.312826] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Endothelial cells (EC) in obese adipose tissue (AT) are exposed to a chronic proinflammatory environment that may induce a mesenchymal-like phenotype and altered function. The objective of this study was to establish whether endothelial-to-mesenchymal transition (EndoMT) is present in human AT in obesity and to investigate the effect of such transition on endothelial function and the endothelial particulate secretome represented by extracellular vesicles (EV). Approach and Results: We identified EndoMT in obese human AT depots by immunohistochemical co-localization of CD31 or vWF and α-SMA (alpha-smooth muscle actin). We showed that AT EC exposed in vitro to TGF-β (tumor growth factor-β), TNF-α (tumor necrosis factor-α), and IFN-γ (interferon-γ) undergo EndoMT with progressive loss of endothelial markers. The phenotypic change results in failure to maintain a tight barrier in culture, increased migration, and reduced angiogenesis. EndoMT also reduced mitochondrial oxidative phosphorylation and glycolytic capacity of EC. EVs produced by EC that underwent EndoMT dramatically reduced angiogenic capacity of the recipient naïve ECs without affecting their migration or proliferation. Proteomic analysis of EV produced by EC in the proinflammatory conditions showed presence of several pro-inflammatory and immune proteins along with an enrichment in angiogenic receptors. CONCLUSIONS We demonstrated the presence of EndoMT in human AT in obesity. EndoMT in vitro resulted in production of EV that transferred some of the functional and metabolic features to recipient naïve EC. This result suggests that functional and molecular features of EC that underwent EndoMT in vivo can be disseminated in a paracrine or endocrine fashion and may induce endothelial dysfunction in distant vascular beds.
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Affiliation(s)
- Bronson A Haynes
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - Li Fang Yang
- Department of Microbiology and Cell and Molecular Biology and Leroy T. Canoles Cancer Center (L.F.Y., V.L.C., O.J.S.), Eastern Virginia Medical School, Norfolk
| | - Ryan W Huyck
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - Eric J Lehrer
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - Joshua M Turner
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - Nektarios Barabutis
- Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe (N.B.)
| | - Vanessa L Correll
- Department of Microbiology and Cell and Molecular Biology and Leroy T. Canoles Cancer Center (L.F.Y., V.L.C., O.J.S.), Eastern Virginia Medical School, Norfolk
| | - Allison Mathiesen
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - William McPheat
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
| | - O John Semmes
- Department of Microbiology and Cell and Molecular Biology and Leroy T. Canoles Cancer Center (L.F.Y., V.L.C., O.J.S.), Eastern Virginia Medical School, Norfolk
| | - Anca D Dobrian
- the Department of Physiological Sciences (B.A.H., R.W.H., E.J.L., J.M.T., A.M., W.M., A.D.D.), Eastern Virginia Medical School, Norfolk
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26
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Felix RG, Bovolato ALC, Cotrim OS, Leão PDS, Batah SS, Golim MDA, Velosa AP, Teodoro W, Martins V, Cruz FF, Deffune E, Fabro AT, Capelozzi VL. Adipose-derived stem cells and adipose-derived stem cell-conditioned medium modulate in situ imbalance between collagen I- and collagen V-mediated IL-17 immune response recovering bleomycin pulmonary fibrosis. Histol Histopathol 2019; 35:289-301. [PMID: 31318036 DOI: 10.14670/hh-18-152] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The immunogenic collagen V (Col V) and the proinflammatory cytokine interleukin (IL)-17 have been implicated in the pathogenesis of multiple autoimmune diseases. Col V is also up-regulated during adipogenesis and can stimulate adipocyte differentiation in vitro. Conditioned medium (CM) generated from adipose-derived mesenchymal stem cells (MSCs) reduces bleomycin (BLM)-induced lung injury in rats, suggesting a crucial role in situ of immunomodulatory factors secreted by MSCs in these beneficial effects. In the present work, we investigated this hypothesis, analyzing levels of plasma inflammatory mediators and inflammatory and fibrotic mediators in the lung tissue of BLM-injured rats after treatment with MSCs and CM. Pulmonary fibrosis was intratracheally induced by BLM. After 10 days, BLM animals were further randomized into subgroups receiving saline, MSCs, or CM intravenously. On days 14 and 21, the animals were euthanized, and the lungs were examined through protein expression of nitric oxide synthase (NOS), IL-17, transforming growth factor-β (TGF-β), vascular endothelial growth factor, endothelin-1, and the immunogenic Col V through histological quantitative evaluation and plasma levels of fibrinogen, Von Willebrand factor, and platelet-derived growth factor (PDGF). Rats that had been injected with MSCs and CM showed a significant increase in weight and significant improvements at 14 and 21 days after intravenous injection at both time points of analysis of plasma fibrinogen, PDGF, and Von Willebrand factor and NOS-2 expression, supporting an early anti-inflammatory action, thus reducing TGF-β and collagen I fibers. In contrast, intravenous injection of CM was able to significantly increase the deposition of Col V fibers and IL-17 on both day 14 and day 21 as compared with the amount observed in rats from the BLM group and MSC groups. In conclusion, this study reinforces previous observations on the therapeutic properties of MSCs and CM and is the first report to demonstrate the association of its actions with immunomodulatory biomarkers on lung tissue. We concluded that adipose-derived stem cells and adipose-derived stem cells-CM modulate an in situ imbalance between collagen I- and Col V-mediated IL-17 immune response, emerging as a promising therapeutic option for recovering from BLM pulmonary fibrosis.
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Affiliation(s)
| | | | | | | | | | | | - Ana Paula Velosa
- Rheumatology Division, Faculdade de Medicina, Universidade de São Paulo, Brazil
| | - Walcy Teodoro
- Rheumatology Division, Faculdade de Medicina, Universidade de São Paulo, Brazil
| | - Vanessa Martins
- Department of Pathology, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Fernanda Ferreira Cruz
- Laboratory of Pulmonary Investigation, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Brazil
| | | | | | - Vera Luiza Capelozzi
- Department of Pathology, Faculty of Medicine, University of São Paulo, São Paulo, Brazil.
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Vivekanadhan S, Mukhopadhyay D. Divergent roles of Plexin D1 in cancer. Biochim Biophys Acta Rev Cancer 2019; 1872:103-110. [PMID: 31152824 DOI: 10.1016/j.bbcan.2019.05.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/06/2019] [Accepted: 05/28/2019] [Indexed: 11/18/2022]
Abstract
Plexin D1 belongs to a family of transmembrane proteins called plexins. It was characterized as a receptor for semaphorins and is known to be essential for axonal guidance and vascular patterning. Mutations in Plexin D1 have been implicated in pathologic conditions such as truncus arteriosus and Möbius syndrome. Emerging data show that expression of Plexin D1 is deregulated in several cancers; it can support tumor development by aiding in tumor metastasis and EMT; and conversely, it can act as a dependence receptor and stimulate cell death in the absence of its canonical ligand, semaphorin 3E. The role of Plexin D1 in tumor development and progression is thereby garnering research interest for its potential as a biomarker and as a therapeutic target. In this review, we describe its discovery, structure, mutations, role(s) in cancer, and therapeutic potential.
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Affiliation(s)
- Sneha Vivekanadhan
- Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic College of Medicine and Science, Jacksonville, FL, USA
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Carretero-Ortega J, Chhangawala Z, Hunt S, Narvaez C, Menéndez-González J, Gay CM, Zygmunt T, Li X, Torres-Vázquez J. GIPC proteins negatively modulate Plexind1 signaling during vascular development. eLife 2019; 8:e30454. [PMID: 31050647 PMCID: PMC6499541 DOI: 10.7554/elife.30454] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 04/15/2019] [Indexed: 12/18/2022] Open
Abstract
Semaphorins (SEMAs) and their Plexin (PLXN) receptors are central regulators of metazoan cellular communication. SEMA-PLXND1 signaling plays important roles in cardiovascular, nervous, and immune system development, and cancer biology. However, little is known about the molecular mechanisms that modulate SEMA-PLXND1 signaling. As PLXND1 associates with GIPC family endocytic adaptors, we evaluated the requirement for the molecular determinants of their association and PLXND1's vascular role. Zebrafish that endogenously express a Plxnd1 receptor with a predicted impairment in GIPC binding exhibit low penetrance angiogenesis deficits and antiangiogenic drug hypersensitivity. Moreover, gipc mutant fish show angiogenic impairments that are ameliorated by reducing Plxnd1 signaling. Finally, GIPC depletion potentiates SEMA-PLXND1 signaling in cultured endothelial cells. These findings expand the vascular roles of GIPCs beyond those of the Vascular Endothelial Growth Factor (VEGF)-dependent, proangiogenic GIPC1-Neuropilin 1 complex, recasting GIPCs as negative modulators of antiangiogenic PLXND1 signaling and suggest that PLXND1 trafficking shapes vascular development.
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Affiliation(s)
- Jorge Carretero-Ortega
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Zinal Chhangawala
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Shane Hunt
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Carlos Narvaez
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Javier Menéndez-González
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Carl M Gay
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Tomasz Zygmunt
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
| | - Xiaochun Li
- Department of Population HealthNew York University School of MedicineNew YorkUnited States
| | - Jesús Torres-Vázquez
- Department of Cell Biology, Skirball Institute of Biomolecular MedicineNew York University Langone Medical CenterNew YorkUnited States
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29
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Kerr AG, Sinha I, Dadvar S, Arner P, Dahlman I. Epigenetic regulation of diabetogenic adipose morphology. Mol Metab 2019; 25:159-167. [PMID: 31031182 PMCID: PMC6600120 DOI: 10.1016/j.molmet.2019.04.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 04/13/2019] [Indexed: 12/17/2022] Open
Abstract
Objective Hypertrophic white adipose tissue (WAT) morphology is associated with insulin resistance and type 2 diabetes. The mechanisms governing hyperplastic versus hypertrophic WAT expansion are poorly understood. We assessed if epigenetic modifications in adipocytes are associated with hypertrophic adipose morphology. A subset of genes with differentially methylated CpG-sites (DMS) in the promoters was taken forward for functional evaluation. Methods The study included 126 women who underwent abdominal subcutaneous biopsy to determine adipose morphology. Global transcriptome profiling was performed on WAT from 113 of the women, and CpG methylome profiling on isolated adipocytes from 78 women. Small interfering RNAs (siRNA) knockdown in human mesenchymal stem cells (hMSCs) was used to assess influence of specific genes on lipid storage. Results A higher proportion of CpG-sites were methylated in hypertrophic compared to hyperplastic WAT. Methylation at 35,138 CpG-sites was found to correlate to adipose morphology. 2,102 of these CpG-sites were also differentially methylated in T2D; 98% showed directionally consistent change in methylation in WAT hypertrophy and T2D. We identified 2,508 DMS in 638 adipose morphology-associated genes where methylation correlated with gene expression. These genes were over-represented in gene sets relevant to WAT hypertrophy, such as insulin resistance, lipolysis, extracellular matrix organization, and innate immunity. siRNA knockdown of ADH1B, AZGP1, C14orf180, GYG2, HADH, PRKAR2B, PFKFB3, and AQP7 influenced lipid storage and metabolism. Conclusion CpG methylation could be influential in determining adipose morphology and thereby constitute a novel antidiabetic target. We identified C14orf180 as a novel regulator of adipocyte lipid storage and possibly differentiation. Hypertrophic adipose morphology display a distinct adipocyte CpG-methylome profile. Adipose hypertrophy and type 2 diabetes display strong overlap in CpG-methylome profile. C14orf180 is a novel regulator of adipocyte lipid storage and possibly adipogenesis.
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Affiliation(s)
- A G Kerr
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - I Sinha
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - S Dadvar
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - P Arner
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - I Dahlman
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden.
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30
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Qiu X, Iwasaki N, Chen K, Shimasaki Y, Oshima Y. Tributyltin and perfluorooctane sulfonate play a synergistic role in promoting excess fat accumulation in Japanese medaka (Oryzias latipes) via in ovo exposure. CHEMOSPHERE 2019; 220:687-695. [PMID: 30605811 DOI: 10.1016/j.chemosphere.2018.12.191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/26/2018] [Accepted: 12/28/2018] [Indexed: 06/09/2023]
Abstract
The ubiquitous environmental obesogens tributyltin (TBT) and perfluorooctane sulfonate (PFOS) may accumulate in parent and be transferred to their offspring, resulting in trans-generational adverse effects. In this study, we investigated the combined toxic and obesogenic effects of TBT and PFOS on the early life stages of Japanese medaka (Oryzias latipes). In ovo nanoinjection was used to simulate the maternal transfer process. Doses were controlled at 0, 0.05, 0.5, and 2.5 ng/egg (TBT) and at 0, 0.05, 0.5, and 5.0 ng/egg (PFOS), with a full factorial design for mixture formulations. Relatively high doses of agents in mixtures were needed to induce significant mortality (TBT ≥ 0.5 ng/egg) or delayed hatching (PFOS = 5.0 ng/egg) of embryos. The interaction between TBT and PFOS in mixtures had significant effects on the observed hatching delay, but not on acute mortality. Compared with controls, separate exposure to TBT (or PFOS) notably elevated adipose areas at the doses of 0.05 and 0.5 ng/egg, but not at the highest doses. Combined exposure significantly promoted the fat accumulation in newly hatched larvae, even when the doses of TBT and PFOS were both at the levels that did not show obesogenic effect. The interactive effect of TBT and PFOS could aggravate the total obesogenic effect of their mixtures, indicating a synergistic interaction. These results highlight the importance of paying close attention to interaction effects when addressing the impacts of mixtures of environmental obesogens.
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Affiliation(s)
- Xuchun Qiu
- Institute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China; Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Naoto Iwasaki
- Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Kun Chen
- Institute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China; Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Yohei Shimasaki
- Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Yuji Oshima
- Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan.
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31
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van der Klaauw AA, Croizier S, Mendes de Oliveira E, Stadler LKJ, Park S, Kong Y, Banton MC, Tandon P, Hendricks AE, Keogh JM, Riley SE, Papadia S, Henning E, Bounds R, Bochukova EG, Mistry V, O'Rahilly S, Simerly RB, Minchin JEN, Barroso I, Jones EY, Bouret SG, Farooqi IS. Human Semaphorin 3 Variants Link Melanocortin Circuit Development and Energy Balance. Cell 2019; 176:729-742.e18. [PMID: 30661757 PMCID: PMC6370916 DOI: 10.1016/j.cell.2018.12.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 08/28/2018] [Accepted: 12/05/2018] [Indexed: 12/19/2022]
Abstract
Hypothalamic melanocortin neurons play a pivotal role in weight regulation. Here, we examined the contribution of Semaphorin 3 (SEMA3) signaling to the development of these circuits. In genetic studies, we found 40 rare variants in SEMA3A-G and their receptors (PLXNA1-4; NRP1-2) in 573 severely obese individuals; variants disrupted secretion and/or signaling through multiple molecular mechanisms. Rare variants in this set of genes were significantly enriched in 982 severely obese cases compared to 4,449 controls. In a zebrafish mutagenesis screen, deletion of 7 genes in this pathway led to increased somatic growth and/or adiposity demonstrating that disruption of Semaphorin 3 signaling perturbs energy homeostasis. In mice, deletion of the Neuropilin-2 receptor in Pro-opiomelanocortin neurons disrupted their projections from the arcuate to the paraventricular nucleus, reduced energy expenditure, and caused weight gain. Cumulatively, these studies demonstrate that SEMA3-mediated signaling drives the development of hypothalamic melanocortin circuits involved in energy homeostasis.
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Affiliation(s)
- Agatha A van der Klaauw
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Sophie Croizier
- The Saban Research Institute, Developmental Neuroscience Program, Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA 90027, USA; Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Edson Mendes de Oliveira
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Lukas K J Stadler
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Soyoung Park
- The Saban Research Institute, Developmental Neuroscience Program, Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA 90027, USA
| | - Youxin Kong
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK; Pathogenesis of Vascular Infections Unit, INSERM, Institut Pasteur, Paris, France
| | - Matthew C Banton
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK; School of Biological and Marine Sciences, University of Plymouth, Plymouth, UK
| | - Panna Tandon
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, UK
| | - Audrey E Hendricks
- Wellcome Sanger Institute, Cambridge, UK; Department of Mathematical and Statistical Sciences, University of Colorado-Denver, Denver, CO 80204, USA
| | - Julia M Keogh
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Susanna E Riley
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, UK
| | - Sofia Papadia
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Elana Henning
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Rebecca Bounds
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Elena G Bochukova
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK; The Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Vanisha Mistry
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Stephen O'Rahilly
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - Richard B Simerly
- The Saban Research Institute, Developmental Neuroscience Program, Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA 90027, USA; Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee, TN 37232-0615, USA
| | - James E N Minchin
- Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, UK
| | - Inês Barroso
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK; Wellcome Sanger Institute, Cambridge, UK
| | - E Yvonne Jones
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Sebastien G Bouret
- The Saban Research Institute, Developmental Neuroscience Program, Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA 90027, USA; INSERM U1172, Jean-Pierre Aubert Research Center, Lille, France.
| | - I Sadaf Farooqi
- University of Cambridge Metabolic Research Laboratories and NIHR Cambridge Biomedical Research Centre, Wellcome-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK.
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32
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Dissecting metabolism using zebrafish models of disease. Biochem Soc Trans 2019; 47:305-315. [PMID: 30700500 DOI: 10.1042/bst20180335] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/18/2018] [Accepted: 01/02/2019] [Indexed: 02/07/2023]
Abstract
Zebrafish (Danio rerio) are becoming an increasingly powerful model organism to study the role of metabolism in disease. Since its inception, the zebrafish model has relied on unique attributes such as the transparency of embryos, high fecundity and conservation with higher vertebrates, to perform phenotype-driven chemical and genetic screens. In this review, we describe how zebrafish have been used to reveal novel mechanisms by which metabolism regulates embryonic development, obesity, fatty liver disease and cancer. In addition, we will highlight how new approaches in advanced microscopy, transcriptomics and metabolomics using zebrafish as a model system have yielded fundamental insights into the mechanistic underpinnings of disease.
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33
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Faillaci F, Milosa F, Critelli RM, Turola E, Schepis F, Villa E. Obese zebrafish: A small fish for a major human health condition. Animal Model Exp Med 2018; 1:255-265. [PMID: 30891575 PMCID: PMC6388073 DOI: 10.1002/ame2.12042] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 10/11/2018] [Accepted: 10/18/2018] [Indexed: 12/14/2022] Open
Abstract
Obesity is becoming a silent worldwide epidemic, with a steady increase in both adults and children. To date, even though several drugs have been licensed for long-term obesity treatment, none of them are yet used in routine clinical practice. So far the only successful intervention has been behavioral therapy. A suitable and economic experimental model mimicking the human condition would therefore be extremely useful to evaluate preventive measures and novel treatments. Zebrafish are emerging as an important model system to study obesity and related metabolic disease. Remarkable similarities have been reported in lipid metabolism and the adipogenic pathway between zebrafish and mammals. Moreover, the zebrafish possesses a number of features-the relative inexpensiveness of animal husbandry, its optical transparency and the ability to produce a large number of offspring at low cost-that make it ideal for large-scale screening and for testing drugs and intervention. In this review, we summarize recent progress in using zebrafish as a model system to study obesity and obesity-related metabolic disorders. We describe several zebrafish models (in both larvae and adult animals) that develop obesity and non-alcoholic fatty liver disease (NAFLD) using different approaches, including gene manipulation, diet manipulation and modification of microbiota composition. For these models, we have outlined the specific aspects related to obesity and its development and we have summarized their advantages and limitations.
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Affiliation(s)
- Francesca Faillaci
- Department of Internal MedicineGastroenterology UnitUniversity of Modena and Reggio EmiliaModenaItaly
- Women in Hepatology GroupModenaItaly
| | - Fabiola Milosa
- Women in Hepatology GroupModenaItaly
- National Institute of Gastroenterology“S. de Bellis” Research HospitalCastellana GrotteItaly
| | - Rosina Maria Critelli
- Department of Internal MedicineGastroenterology UnitUniversity of Modena and Reggio EmiliaModenaItaly
- Women in Hepatology GroupModenaItaly
| | - Elena Turola
- Department of Internal MedicineEndocrinology UnitAOU of ParmaParmaItaly
| | - Filippo Schepis
- Department of Internal MedicineGastroenterology UnitUniversity of Modena and Reggio EmiliaModenaItaly
| | - Erica Villa
- Department of Internal MedicineGastroenterology UnitUniversity of Modena and Reggio EmiliaModenaItaly
- Women in Hepatology GroupModenaItaly
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34
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Zang L, Maddison LA, Chen W. Zebrafish as a Model for Obesity and Diabetes. Front Cell Dev Biol 2018; 6:91. [PMID: 30177968 PMCID: PMC6110173 DOI: 10.3389/fcell.2018.00091] [Citation(s) in RCA: 142] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 07/25/2018] [Indexed: 12/13/2022] Open
Abstract
Obesity and diabetes now considered global epidemics. The prevalence rates of diabetes are increasing in parallel with the rates of obesity and the strong connection between these two diseases has been coined as “diabesity.” The health risks of overweight or obesity include Type 2 diabetes mellitus (T2DM), coronary heart disease and cancer of numerous organs. Both obesity and diabetes are complex diseases that involve the interaction of genetics and environmental factors. The underlying pathogenesis of obesity and diabetes are not well understood and further research is needed for pharmacological and surgical management. Consequently, the use of animal models of obesity and/or diabetes is important for both improving the understanding of these diseases and to identify and develop effective treatments. Zebrafish is an attractive model system for studying metabolic diseases because of the functional conservation in lipid metabolism, adipose biology, pancreas structure, and glucose homeostasis. It is also suited for identification of novel targets associated with the risk and treatment of obesity and diabetes in humans. In this review, we highlight studies using zebrafish to model metabolic diseases, and discuss the advantages and disadvantages of studying pathologies associated with obesity and diabetes in zebrafish.
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Affiliation(s)
- Liqing Zang
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, United States.,Graduate School of Regional Innovation Studies, Mie University, Tsu, Japan
| | - Lisette A Maddison
- Center for Reproductive Biology, Washington State University, Pullman, WA, United States
| | - Wenbiao Chen
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, United States
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35
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Minchin JEN, Scahill CM, Staudt N, Busch-Nentwich EM, Rawls JF. Deep phenotyping in zebrafish reveals genetic and diet-induced adiposity changes that may inform disease risk. J Lipid Res 2018; 59:1536-1545. [PMID: 29794036 DOI: 10.1194/jlr.d084525] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/22/2018] [Indexed: 02/06/2023] Open
Abstract
The regional distribution of adipose tissues is implicated in a wide range of diseases. For example, proportional increases in visceral adipose tissue increase the risk for insulin resistance, diabetes, and CVD. Zebrafish offer a tractable model system by which to obtain unbiased and quantitative phenotypic information on regional adiposity, and deep phenotyping can explore complex disease-related adiposity traits. To facilitate deep phenotyping of zebrafish adiposity traits, we used pairwise correlations between 67 adiposity traits to generate stage-specific adiposity profiles that describe changing adiposity patterns and relationships during growth. Linear discriminant analysis classified individual fish according to an adiposity profile with 87.5% accuracy. Deep phenotyping of eight previously uncharacterized zebrafish mutants identified neuropilin 2b as a novel gene that alters adipose distribution. When we applied deep phenotyping to identify changes in adiposity during diet manipulations, zebrafish that underwent food restriction and refeeding had widespread adiposity changes when compared with continuously fed, equivalently sized control animals. In particular, internal adipose tissues (e.g., visceral adipose) exhibited a reduced capacity to replenish lipid following food restriction. Together, these results in zebrafish establish a new deep phenotyping technique as an unbiased and quantitative method to help uncover new relationships between genotype, diet, and adiposity.
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Affiliation(s)
- James E N Minchin
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, United Kingdom, EH16 4TJ .,Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27710
| | - Catherine M Scahill
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton, United Kingdom, CB10 1SA
| | - Nicole Staudt
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton, United Kingdom, CB10 1SA
| | - Elisabeth M Busch-Nentwich
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton, United Kingdom, CB10 1SA.,Department of Medicine, University of Cambridge, Cambridge, United Kingdom, CB2 0QQ
| | - John F Rawls
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27710.,Department of Medicine, University of Cambridge, Cambridge, United Kingdom, CB2 0QQ
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36
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Briot A, Decaunes P, Volat F, Belles C, Coupaye M, Ledoux S, Bouloumié A. Senescence Alters PPARγ (Peroxisome Proliferator–Activated Receptor Gamma)-Dependent Fatty Acid Handling in Human Adipose Tissue Microvascular Endothelial Cells and Favors Inflammation. Arterioscler Thromb Vasc Biol 2018; 38:1134-1146. [DOI: 10.1161/atvbaha.118.310797] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 03/01/2018] [Indexed: 02/06/2023]
Abstract
Objective—
Adipose tissue (AT) dysfunction associated with obesity or aging is a major cause for lipid redistribution and the progression of cardiometabolic disorders. Our goal is to decipher the contribution of human AT microvascular endothelial cells (ECs) in the maintenance of fatty acid (FA) fluxes and the impact of senescence on their function.
Approach and Results—
We used freshly isolated primary microvascular ECs from human AT. Our data identified the endothelial FA handling machinery including FATPs (FA transport proteins) FATP1, FATP3, FATP4, and CD36 as well as FABP4 (FA binding protein 4). We showed that PPARγ (peroxisome proliferator–activated receptor gamma) regulates the expression of FATP1, CD36, and FABP4 and is a major regulator of FA uptake in human AT EC (hATEC). We provided evidence that endothelial PPARγ activity is modulated by senescence. Indeed, the positive regulation of FA transport by PPARγ agonist was abolished, whereas the emergence of an inflammatory response was favored in senescent hATEC. This was associated with the retention of nuclear FOXO1 (forkhead box protein O1), whereas nuclear PPARγ translocation was impaired.
Conclusions—
These data support the notion that PPARγ is a key regulator of primary hATEC function including FA handling and inflammatory response. However, the outcome of PPARγ activation is modulated by senescence, a phenomenon that may impact the ability of hATEC to properly respond to and handle lipid fluxes. Finally, our work highlights the role of hATEC in the regulation of FA fluxes and reveals that dysfunction of these cells with accelerated aging is likely to participate to AT dysfunction and the redistribution of lipids.
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Affiliation(s)
- Anaïs Briot
- From the Inserm, UMR1048, Team 1, I2MC, Institute of Metabolic and Cardiovascular Diseases, Université de Toulouse, Toulouse, Cedex 4, France (A. Briot, P.D., F.V., C.B., A. Bouloumié)
| | - Pauline Decaunes
- From the Inserm, UMR1048, Team 1, I2MC, Institute of Metabolic and Cardiovascular Diseases, Université de Toulouse, Toulouse, Cedex 4, France (A. Briot, P.D., F.V., C.B., A. Bouloumié)
| | - Fanny Volat
- From the Inserm, UMR1048, Team 1, I2MC, Institute of Metabolic and Cardiovascular Diseases, Université de Toulouse, Toulouse, Cedex 4, France (A. Briot, P.D., F.V., C.B., A. Bouloumié)
| | - Chloé Belles
- From the Inserm, UMR1048, Team 1, I2MC, Institute of Metabolic and Cardiovascular Diseases, Université de Toulouse, Toulouse, Cedex 4, France (A. Briot, P.D., F.V., C.B., A. Bouloumié)
| | - Muriel Coupaye
- Center Support of Obesity, Hôpital Louis Mourier (APHP), Colombes, and Faculté Paris Diderot, France (M.C., S.L.)
| | - Séverine Ledoux
- Center Support of Obesity, Hôpital Louis Mourier (APHP), Colombes, and Faculté Paris Diderot, France (M.C., S.L.)
| | - Anne Bouloumié
- From the Inserm, UMR1048, Team 1, I2MC, Institute of Metabolic and Cardiovascular Diseases, Université de Toulouse, Toulouse, Cedex 4, France (A. Briot, P.D., F.V., C.B., A. Bouloumié)
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Abstract
Adipose morphology is defined as the number and size distribution of adipocytes (fat cells) within adipose tissue. Adipose tissue with fewer but larger adipocytes is said to have a 'hypertrophic' morphology, whereas adipose with many adipocytes of a smaller size is said to have a 'hyperplastic' morphology. Hypertrophic adipose morphology is positively associated with insulin resistance, diabetes and cardiovascular disease. By contrast, hyperplastic morphology is associated with improved metabolic parameters. These phenotypic associations suggest that adipose morphology influences risk of cardiometabolic disease. Intriguingly, monozygotic twin studies have determined that adipose morphology is in part determined genetically. Therefore, identifying the genetic regulation of adipose morphology may help us to predict, prevent and ameliorate insulin resistance and associated metabolic diseases. Here, we review the current literature regarding adipose morphology in relation to: (1) metabolic and medical implications; (2) the methods used to assess adipose morphology; and (3) transcriptional differences between morphologies. We further highlight three mechanisms that have been hypothesized to promote adipocyte hypertrophy and thus to regulate adipose morphology.
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Affiliation(s)
- Panna Tandon
- British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, Scotland, UK
| | - Rebecca Wafer
- British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, Scotland, UK
| | - James E N Minchin
- British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, Scotland, UK
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38
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Abstract
Although the major white adipose depots evolved primarily to store energy, secrete hormones and thermo-insulate the body, multiple secondary depots developed additional specialized and unconventional functions. Unlike any other fat tissue, dermal white adipose tissue (dWAT) evolved a large repertoire of novel features that are central to skin physiology, which we discuss in this Review. dWAT exists in close proximity to hair follicles, the principal appendages of the skin that periodically grow new hairs. Responding to multiple hair-derived signals, dWAT becomes closely connected to cycling hair follicles and periodically cycles itself. At the onset of new hair growth, hair follicles secrete activators of adipogenesis, while at the end of hair growth, a reduction in the secretion of activators or potentially, an increase in the secretion of inhibitors of adipogenesis, results in fat lipolysis. Hair-driven cycles of dWAT remodelling are uncoupled from size changes in other adipose depots that are controlled instead by systemic metabolic demands. Rich in growth factors, dWAT reciprocally signals to hair follicles, altering the activation state of their stem cells and modulating the pace of hair regrowth. dWAT cells also facilitate skin repair following injury and infection. In response to wounding, adipose progenitors secrete repair-inducing activators, while bacteria-sensing adipocytes produce antimicrobial peptides, thus aiding innate immune responses in the skin.
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Affiliation(s)
- Christian F Guerrero-Juarez
- Department of Developmental and Cell Biology, 2011 Biological Sciences III, University of California, Irvine, Irvine, California 92697, USA
- Sue and Bill Gross Stem Cell Research Center, 845 Health Sciences Road, University of California, Irvine, Irvine, California 92697, USA
- Center for Complex Biological Systems, 2620 Biological Sciences III, University of California, Irvine, Irvine, California 92697, USA
| | - Maksim V Plikus
- Department of Developmental and Cell Biology, 2011 Biological Sciences III, University of California, Irvine, Irvine, California 92697, USA
- Sue and Bill Gross Stem Cell Research Center, 845 Health Sciences Road, University of California, Irvine, Irvine, California 92697, USA
- Center for Complex Biological Systems, 2620 Biological Sciences III, University of California, Irvine, Irvine, California 92697, USA
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39
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Kamel M, Ninov N. Catching new targets in metabolic disease with a zebrafish. Curr Opin Pharmacol 2017; 37:41-50. [DOI: 10.1016/j.coph.2017.08.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/04/2017] [Accepted: 08/11/2017] [Indexed: 12/12/2022]
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40
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Minchin JEN, Rawls JF. Elucidating the role of plexin D1 in body fat distribution and susceptibility to metabolic disease using a zebrafish model system. Adipocyte 2017; 6:277-283. [PMID: 28792859 DOI: 10.1080/21623945.2017.1356504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Non-communicable diseases (NCDs) such as cardiovascular disease, diabetes and cancer were responsible for 68% of all deaths worldwide in 2012. The regional distribution of lipid deposited within adipose tissue (AT) - so called body fat distribution (BFD) - is a strong risk factor for NCDs. BFD is highly heritable; however, the genetic basis of BFD is almost entirely unknown. Genome-wide association studies have identified several loci associated with BFD, including at Plexin D1 (PLXND1) - a gene known to modulate angiogenesis. We recently demonstrated that zebrafish homozygous for a null mutation in plxnd1 had a reduced capacity to store lipid in visceral AT (VAT) leading to altered BFD. Moreover, we found that type V collagens were upregulated in plxnd1 mutants, and mediated the inhibitory effect of Plxnd1 on VAT growth. These results strengthen evidence that Plxnd1 influences BFD in human populations, and validate zebrafish as a model to study BFD. However, many pertinent questions remain unanswered. Here we outline potential Plxnd1 mechanisms of action in AT, and describe the genetic architecture at human PLXND1 that is associated with BFD and NCD susceptibility.
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Affiliation(s)
- James E. N. Minchin
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC, USA
- British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
| | - John F. Rawls
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC, USA
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41
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Gut P, Reischauer S, Stainier DYR, Arnaout R. LITTLE FISH, BIG DATA: ZEBRAFISH AS A MODEL FOR CARDIOVASCULAR AND METABOLIC DISEASE. Physiol Rev 2017; 97:889-938. [PMID: 28468832 PMCID: PMC5817164 DOI: 10.1152/physrev.00038.2016] [Citation(s) in RCA: 194] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 01/09/2017] [Accepted: 01/10/2017] [Indexed: 12/17/2022] Open
Abstract
The burden of cardiovascular and metabolic diseases worldwide is staggering. The emergence of systems approaches in biology promises new therapies, faster and cheaper diagnostics, and personalized medicine. However, a profound understanding of pathogenic mechanisms at the cellular and molecular levels remains a fundamental requirement for discovery and therapeutics. Animal models of human disease are cornerstones of drug discovery as they allow identification of novel pharmacological targets by linking gene function with pathogenesis. The zebrafish model has been used for decades to study development and pathophysiology. More than ever, the specific strengths of the zebrafish model make it a prime partner in an age of discovery transformed by big-data approaches to genomics and disease. Zebrafish share a largely conserved physiology and anatomy with mammals. They allow a wide range of genetic manipulations, including the latest genome engineering approaches. They can be bred and studied with remarkable speed, enabling a range of large-scale phenotypic screens. Finally, zebrafish demonstrate an impressive regenerative capacity scientists hope to unlock in humans. Here, we provide a comprehensive guide on applications of zebrafish to investigate cardiovascular and metabolic diseases. We delineate advantages and limitations of zebrafish models of human disease and summarize their most significant contributions to understanding disease progression to date.
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Affiliation(s)
- Philipp Gut
- Nestlé Institute of Health Sciences, EPFL Innovation Park, Lausanne, Switzerland; Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and Cardiovascular Research Institute and Division of Cardiology, Department of Medicine, University of California San Francisco, San Francisco, California
| | - Sven Reischauer
- Nestlé Institute of Health Sciences, EPFL Innovation Park, Lausanne, Switzerland; Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and Cardiovascular Research Institute and Division of Cardiology, Department of Medicine, University of California San Francisco, San Francisco, California
| | - Didier Y R Stainier
- Nestlé Institute of Health Sciences, EPFL Innovation Park, Lausanne, Switzerland; Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and Cardiovascular Research Institute and Division of Cardiology, Department of Medicine, University of California San Francisco, San Francisco, California
| | - Rima Arnaout
- Nestlé Institute of Health Sciences, EPFL Innovation Park, Lausanne, Switzerland; Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany; and Cardiovascular Research Institute and Division of Cardiology, Department of Medicine, University of California San Francisco, San Francisco, California
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42
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Yan J, Su R, Ao D, Wang Y, Wang H, Yang H. Genetic variants and clinical relevance associated with gestational diabetes mellitus in Chinese women: a case-control study. J Matern Fetal Neonatal Med 2017; 31:2115-2121. [PMID: 28554271 DOI: 10.1080/14767058.2017.1336225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
PURPOSE Gestational diabetes mellitus (GDM) may share similar mechanisms with type 2 diabetes and obesity. In the current study, we aimed to verify twenty genes reported to be associated with type 2 diabetes and obesity in the Chinese GDM population. METHODS Pregnant women aged 20-49 years at 24-28 gestational weeks were recruited and 556 cases and 445 controls were enrolled in the study. The genotyping of single nucleotide polymorphisms (SNPs) was performed on peripheral blood samples. RESULTS We discovered that GDM was associated with rs945508 (OR = 1.368, 95% CI = 1.080-1.732, p = .009), rs10804591 (OR = 1.446, 95% CI = 1.192-1.754, p < .001), rs10245353 (OR = 1.204, 95% CI = 1.006-1.441, p = .043) and rs1552224 (OR = 1.451, 95% CI = 1.071-1.964, p = .016). CONCLUSIONS We found that four SNPs associated with type 2 diabetes and obesity may also increase the risk of developing GDM in the Chinese population. Among these SNPs, we report for the first time that rs945508 in ARHGEF11, rs10804591 in PLXND1 and rs10245353 in NFE2L3 were associated with GDM.
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Affiliation(s)
- Jie Yan
- a Department of Obstetrics and Gynecology , Peking University First Hospital , Beijing , China
| | - Rina Su
- a Department of Obstetrics and Gynecology , Peking University First Hospital , Beijing , China
| | - Deng Ao
- b Department of Child, Adolescent and Women's Health, School of Public Health , Peking University , Beijing , China
| | - Yan Wang
- b Department of Child, Adolescent and Women's Health, School of Public Health , Peking University , Beijing , China
| | - Haijun Wang
- b Department of Child, Adolescent and Women's Health, School of Public Health , Peking University , Beijing , China
| | - Huixia Yang
- a Department of Obstetrics and Gynecology , Peking University First Hospital , Beijing , China
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43
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O'Reilly-Pol T, Kniepkamp K, Johnson SL. Three-Dimensional Printed Fish Graders: A Tool to Rapidly and Reliably Size Select Zebrafish. Zebrafish 2017; 14:280-283. [PMID: 28287927 PMCID: PMC5466055 DOI: 10.1089/zeb.2016.1414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Research into adult zebrafish often requires fish to be of a specific size. Currently, fish must be individually measured to achieve this goal. Here, we design and utilize fish graders to quickly sort fish by width. We characterize graders individually for the length of fish they discriminate between and we also analyze graders in pairs to define the range of lengths for a retained population of fish. We note that a 1 mm increase of fish width increases fish length by 6.2-7.2 mm. We provide the schematics to print a series of eight retention widths, and note that graders of any desired retention width can easily be printed by slightly modifying our design files.
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Affiliation(s)
- Thomas O'Reilly-Pol
- Department of Genetics, Washington University in St. Louis , St. Louis, Missouri
| | - Kyle Kniepkamp
- Department of Genetics, Washington University in St. Louis , St. Louis, Missouri
| | - Stephen L Johnson
- Department of Genetics, Washington University in St. Louis , St. Louis, Missouri
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44
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Lutfi E, Babin PJ, Gutiérrez J, Capilla E, Navarro I. Caffeic acid and hydroxytyrosol have anti-obesogenic properties in zebrafish and rainbow trout models. PLoS One 2017; 12:e0178833. [PMID: 28570659 PMCID: PMC5453583 DOI: 10.1371/journal.pone.0178833] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 05/19/2017] [Indexed: 12/18/2022] Open
Abstract
Some natural products, known sources of bioactive compounds with a wide range of properties, may have therapeutic values in human health and diseases, as well as agronomic applications. The effect of three compounds of plant origin with well-known dietary antioxidant properties, astaxanthin (ATX), caffeic acid (CA) and hydroxytyrosol (HT), on zebrafish (Danio rerio) larval adiposity and rainbow trout (Onchorynchus mykiss) adipocytes was assessed. The zebrafish obesogenic test (ZOT) demonstrated the anti-obesogenic activity of CA and HT. These compounds were able to counteract the obesogenic effect produced by the peroxisome proliferator-activated receptor gamma (PPARγ) agonist, rosiglitazone (RGZ). CA and HT suppressed RGZ-increased PPARγ protein expression and lipid accumulation in primary-cultured rainbow trout adipocytes. HT also significantly reduced plasma triacylglycerol concentrations, as well as mRNA levels of the fasn adipogenic gene in the adipose tissue of HT-injected rainbow trout. In conclusion, in vitro and in vivo approaches demonstrated the anti-obesogenic potential of CA and HT on teleost fish models that may be relevant for studying their molecular mode of action. Further studies are required to evaluate the effect of these bioactive components as food supplements for modulating adiposity in farmed fish.
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Affiliation(s)
- Esmail Lutfi
- Department of Cell Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Patrick J. Babin
- Maladies Rares: Génétique et Métabolisme (MRGM), University of Bordeaux, INSERM, U12211, Pessac, France
- * E-mail: (IN); (PJB)
| | - Joaquim Gutiérrez
- Department of Cell Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Encarnación Capilla
- Department of Cell Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Isabel Navarro
- Department of Cell Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain
- * E-mail: (IN); (PJB)
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45
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Minchin JEN, Rawls JF. A classification system for zebrafish adipose tissues. Dis Model Mech 2017; 10:797-809. [PMID: 28348140 PMCID: PMC5482999 DOI: 10.1242/dmm.025759] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 03/15/2017] [Indexed: 12/18/2022] Open
Abstract
The zebrafish model system offers significant utility for in vivo imaging of adipose tissue (AT) dynamics and for screening to identify chemical and genetic modifiers of adiposity. In particular, AT can be quantified accurately in live zebrafish using fluorescent lipophilic dyes. Although this methodology offers considerable promise, the comprehensive identification and classification of zebrafish ATs has not been performed. Here, we use fluorescent lipophilic dyes and in vivo imaging systematically to identify, classify and quantify the zebrafish AT pool. We identify 34 regionally distinct zebrafish ATs, including five visceral ATs and 22 subcutaneous ATs. For each of these ATs, we describe detailed morphological characteristics to aid their identification in future studies. Furthermore, we quantify the areas for each AT and construct regression models to allow prediction of expected AT size and variation across a range of developmental stages. Finally, we demonstrate the utility of this resource for identifying effects of strain variation and high-fat diet on AT growth. Altogether, this resource provides foundational information on the identity, dynamics and expected quantities of zebrafish ATs for use as a reference for future studies. Summary: A standardized nomenclature and classification system for zebrafish adipose tissues and regression models to predict expected adipose size during the course of zebrafish development.
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Affiliation(s)
- James E N Minchin
- Department of Molecular Genetics & Microbiology, Duke University, Durham, NC 27710, USA .,Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.,British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - John F Rawls
- Department of Molecular Genetics & Microbiology, Duke University, Durham, NC 27710, USA.,Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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46
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Leulier F, MacNeil LT, Lee WJ, Rawls JF, Cani PD, Schwarzer M, Zhao L, Simpson SJ. Integrative Physiology: At the Crossroads of Nutrition, Microbiota, Animal Physiology, and Human Health. Cell Metab 2017; 25:522-534. [PMID: 28273475 PMCID: PMC6200423 DOI: 10.1016/j.cmet.2017.02.001] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 01/30/2017] [Accepted: 01/31/2017] [Indexed: 02/07/2023]
Abstract
Nutrition is paramount in shaping all aspects of animal biology. In addition, the influence of the intestinal microbiota on physiology is now widely recognized. Given that diet also shapes the intestinal microbiota, this raises the question of how the nutritional environment and microbial assemblages together influence animal physiology. This research field constitutes a new frontier in the field of organismal biology that needs to be addressed. Here we review recent studies using animal models and humans and propose an integrative framework within which to define the study of the diet-physiology-microbiota systems and ultimately link it to human health. Nutritional Geometry sits centrally in the proposed framework and offers means to define diet compositions that are optimal for individuals and populations.
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Affiliation(s)
- François Leulier
- Institut de Génomique Fonctionnelle de Lyon (IGFL), Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, F-69364 Lyon Cedex 07, France.
| | - Lesley T MacNeil
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S4K1, Canada; Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON L8S4K1, Canada; Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON L8S4K1, Canada
| | - Won-Jae Lee
- School of Biological Science, Institute of Molecular Biology and Genetics, National Creative Research Initiative Center for Hologenomics, Seoul National University, Seoul 151-742, South Korea
| | - John F Rawls
- Department of Molecular Genetics and Microbiology, Center for the Genomics of Microbial Systems, Duke University School of Medicine, Durham, NC 27710, USA
| | - Patrice D Cani
- Université Catholique de Louvain, Louvain Drug Research Institute, WELBIO (Walloon Excellence in Life Sciences and Biotechnology), Metabolism and Nutrition Research Group, B-1200 Brussels, Belgium
| | - Martin Schwarzer
- Institut de Génomique Fonctionnelle de Lyon (IGFL), Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, F-69364 Lyon Cedex 07, France
| | - Liping Zhao
- State Key Laboratory of Microbial Metabolism and Ministry of Education Key Laboratory of Systems Biomedicine, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Stephen J Simpson
- Charles Perkins Centre, University of Sydney, Sydney 2006, Australia; School of Life and Environmental Sciences, University of Sydney, Sydney 2006, Australia
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47
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Wafer R, Tandon P, Minchin JEN. The Role of Peroxisome Proliferator-Activated Receptor Gamma ( PPARG) in Adipogenesis: Applying Knowledge from the Fish Aquaculture Industry to Biomedical Research. Front Endocrinol (Lausanne) 2017; 8:102. [PMID: 28588550 PMCID: PMC5438977 DOI: 10.3389/fendo.2017.00102] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 05/01/2017] [Indexed: 12/13/2022] Open
Abstract
The tropical freshwater zebrafish has recently emerged as a valuable model organism for the study of adipose tissue biology and obesity-related disease. The strengths of the zebrafish model system are its wealth of genetic mutants, transgenic tools, and amenability to high-resolution imaging of cell dynamics within live animals. However, zebrafish adipose research is at a nascent stage and many gaps exist in our understanding of zebrafish adipose physiology and metabolism. By contrast, adipose research within other, closely related, teleost species has a rich and extensive history, owing to the economic importance of these fish as a food source. Here, we compare and contrast knowledge on peroxisome proliferator-activated receptor gamma (PPARG)-mediated adipogenesis derived from both biomedical and aquaculture literatures. We first concentrate on the biomedical literature to (i) briefly review PPARG-mediated adipogenesis in mammals, before (ii) reviewing Pparg-mediated adipogenesis in zebrafish. Finally, we (iii) mine the aquaculture literature to compare and contrast Pparg-mediated adipogenesis in aquaculturally relevant teleosts. Our goal is to highlight evolutionary similarities and differences in adipose biology that will inform our understanding of the role of adipose tissue in obesity and related disease.
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Affiliation(s)
- Rebecca Wafer
- BHF Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Panna Tandon
- BHF Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - James E. N. Minchin
- BHF Centre for Cardiovascular Science, The Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, UK
- *Correspondence: James E. N. Minchin,
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48
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Ehrlund A, Mejhert N, Björk C, Andersson R, Kulyté A, Åström G, Itoh M, Kawaji H, Lassmann T, Daub CO, Carninci P, Forrest ARR, Hayashizaki Y, Sandelin A, Ingelsson E, Rydén M, Laurencikiene J, Arner P, Arner E. Transcriptional Dynamics During Human Adipogenesis and Its Link to Adipose Morphology and Distribution. Diabetes 2017; 66:218-230. [PMID: 27803022 PMCID: PMC5860264 DOI: 10.2337/db16-0631] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/21/2016] [Indexed: 12/20/2022]
Abstract
White adipose tissue (WAT) can develop into several phenotypes with different pathophysiological impact on type 2 diabetes. To better understand the adipogenic process, the transcriptional events that occur during in vitro differentiation of human adipocytes were investigated and the findings linked to WAT phenotypes. Single-molecule transcriptional profiling provided a detailed map of the expressional changes of genes, enhancers, and long noncoding RNAs, where different types of transcripts share common dynamics during differentiation. Common signatures include early downregulated, transient, and late induced transcripts, all of which are linked to distinct developmental processes during adipogenesis. Enhancers expressed during adipogenesis overlap significantly with genetic variants associated with WAT distribution. Transiently expressed and late induced genes are associated with hypertrophic WAT (few but large fat cells), a phenotype closely linked to insulin resistance and type 2 diabetes. Transcription factors that are expressed early or transiently affect differentiation and adipocyte function and are controlled by several well-known upstream regulators such as glucocorticosteroids, insulin, cAMP, and thyroid hormones. Taken together, our results suggest a complex but highly coordinated regulation of adipogenesis.
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Affiliation(s)
- Anna Ehrlund
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Niklas Mejhert
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Christel Björk
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Robin Andersson
- The Bioinformatics Centre, Department of Biology, and Biotech Research & Innovation Centre, University of Copenhagen, Copenhagen, Denmark
| | - Agné Kulyté
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Gaby Åström
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Masayoshi Itoh
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Preventive Medicine & Diagnosis Innovation Program, Wakō, Saitama, Japan
| | - Hideya Kawaji
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Preventive Medicine & Diagnosis Innovation Program, Wakō, Saitama, Japan
| | - Timo Lassmann
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
- Telethon Kids Institute and The University of Western Australia, Perth, Western Australia, Australia
| | - Carsten O Daub
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- Department of Biosciences and Nutrition and Science for Life Laboratory, Karolinska Institutet, Stockholm, Sweden
| | - Piero Carninci
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
| | - Alistair R R Forrest
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
| | - Yoshihide Hayashizaki
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Preventive Medicine & Diagnosis Innovation Program, Wakō, Saitama, Japan
| | - Albin Sandelin
- The Bioinformatics Centre, Department of Biology, and Biotech Research & Innovation Centre, University of Copenhagen, Copenhagen, Denmark
| | - Erik Ingelsson
- Molecular Epidemiology, Department of Medical Sciences, and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | | | - Mikael Rydén
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | | | - Peter Arner
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Erik Arner
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Tsurumi, Yokohama, Kanagawa, Japan
- RIKEN Omics Science Center, Tsurumi, Yokohama, Kanagawa, Japan
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49
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Melancon E, De La Torre Canny SG, Sichel S, Kelly M, Wiles T, Rawls J, Eisen J, Guillemin K. Best practices for germ-free derivation and gnotobiotic zebrafish husbandry. Methods Cell Biol 2017; 138:61-100. [PMID: 28129860 PMCID: PMC5568843 DOI: 10.1016/bs.mcb.2016.11.005] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
All animals are ecosystems with resident microbial communities, referred to as microbiota, which play profound roles in host development, physiology, and evolution. Enabled by new DNA sequencing technologies, there is a burgeoning interest in animal-microbiota interactions, but dissecting the specific impacts of microbes on their hosts is experimentally challenging. Gnotobiology, the study of biological systems in which all members are known, enables precise experimental analysis of the necessity and sufficiency of microbes in animal biology by deriving animals germ-free (GF) and inoculating them with defined microbial lineages. Mammalian host models have long dominated gnotobiology, but we have recently adapted gnotobiotic approaches to the zebrafish (Danio rerio), an important aquatic model. Zebrafish offer several experimental attributes that enable rapid, large-scale gnotobiotic experimentation with high replication rates and exquisite optical resolution. Here we describe detailed protocols for three procedures that form the foundation of zebrafish gnotobiology: derivation of GF embryos, microbial association of GF animals, and long-term, GF husbandry. Our aim is to provide sufficient guidance in zebrafish gnotobiotic methodology to expand and enrich this exciting field of research.
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Affiliation(s)
- E. Melancon
- University of Oregon, Eugene, OR, Unites States
| | | | - S. Sichel
- University of Oregon, Eugene, OR, Unites States
| | - M. Kelly
- University of Oregon, Eugene, OR, Unites States
| | - T.J. Wiles
- University of Oregon, Eugene, OR, Unites States
| | - J.F. Rawls
- Duke University, Durham, NC, United States
| | - J.S. Eisen
- University of Oregon, Eugene, OR, Unites States
| | - K. Guillemin
- University of Oregon, Eugene, OR, Unites States
- Canadian Institute for Advanced Research, Toronto, ON, Canada
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50
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Minchin JEN, Rawls JF. In vivo imaging and quantification of regional adiposity in zebrafish. Methods Cell Biol 2016; 138:3-27. [PMID: 28129849 DOI: 10.1016/bs.mcb.2016.11.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Adipose tissues (ATs) are lipid-rich structures that supply and sequester energy-dense lipid in response to the energy status of an organism. As such, ATs provide an organism energetic insurance during periods of adverse physiological burden. ATs are deposited in diverse anatomical locations, and excessive accumulation of particular regional ATs modulates disease risk. Therefore, a model system that facilitates the visualization and quantification of regional adiposity holds significant biomedical promise. The zebrafish (Danio rerio) has emerged as a new model system for AT research in which the entire complement of regional ATs can be imaged and quantified in live individuals. Here we present detailed methods for labeling adipocytes in live zebrafish using fluorescent lipophilic dyes, and for identifying and quantifying regional zebrafish ATs.
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Affiliation(s)
- J E N Minchin
- University of Edinburgh, Edinburgh, United Kingdom; Duke University, Durham, NC, United States
| | - J F Rawls
- Duke University, Durham, NC, United States
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